Question: Information:  - Charles Robert Redford Jr. (born August 18, 1936) is an American actor, director, producer, businessman, environmentalist, and philanthropist. Redford is the founder of the Sundance Film Festival.  - The Soviet Union, officially the Union of Soviet Socialist Republics (USSR " ) was a socialist state in Eurasia that existed from 1922 to 1991. A union of multiple subnational republics, its government and economy were highly centralized. The Soviet Union was a one-party federation, governed by the Communist Party with Moscow as its capital.  - Thomas Roy "Tom" Skerritt (born August 25, 1933) is an American actor who has appeared in more than forty films and more than two hundred television episodes since 1962. He is known for his roles in "MASH", "Alien", "Top Gun", "A River Runs Through It", "Up in Smoke", and the television series "Picket Fences". Skerritt has earned several awards and nominations, including a Primetime Emmy Award for Outstanding Lead Actor in a Drama Series in 1993 for "Picket Fences".  - Czechoslovakia 1968 is a 1969 short documentary film about the `` Prague Spring '' , the Russian invasion of Czechoslovakia . The film was produced by the United States Information Agency under the direction of Robert M. Fresco and Denis Sanders and features the graphic design of Norman Gollin . It won the Academy Award for Documentary Short Subject and in 1997 , was selected for preservation in the United States National Film Registry by the Library of Congress having been identified as `` culturally , historically , or aesthetically significant '' .  - In international relations, public diplomacy or people's diplomacy, broadly speaking, is the communication with and dissemination of propaganda to foreign public to establish a dialogue designed to inform and influence. There is no one definition of public diplomacy, and it may be easier to describe than to define it, as definitions vary and continue to change over time. It is practiced through a variety of instruments and methods ranging from personal contact and media interviews to the Internet and educational exchanges.  - Direct-to-video or straight-to-video (also known as direct-to-VHS, direct-to-DVD, direct-to-Blu-ray, direct-to-digital, etc.) refers to the release of a film to the public immediately on home video formats rather than a theatrical release or television broadcast. Because inferior sequels or prequels of larger-budget films may be released direct to video, references to direct-to-video releases are often pejorative. Direct-to-video release has also become profitable for independent filmmakers and smaller companies.  - A Time Out of War is a 1954 American short war film directed by Denis Sanders. It won an Academy Award in 1955 for Best Short Subject (Two-Reel), first prize at the Venice Film Festival Live Action Short Film category, and a special BAFTA Award.  - The Academy Awards, or "Oscars", is an annual American awards ceremony hosted by the Academy of Motion Picture Arts and Sciences (AMPAS) to recognize excellence in cinematic achievements in the United States film industry as assessed by the Academy's voting membership. The various category winners are awarded a copy of a statuette, officially called the Academy Award of Merit, which has become commonly known by its nickname "Oscar." The awards, first presented in 1929 at the Hollywood Roosevelt Hotel, are overseen by AMPAS.  - A documentary film is a nonfictional motion picture intended to some aspect of reality, primarily for the purposes of instruction, education, or maintaining a historical record. Such films were originally shot on film stockthe only medium availablebut now include video and digital productions that can be either direct-to-video, made into a TV show, or released for screening in cinemas. "Documentary" has been described as a "filmmaking practice, a cinematic tradition, and mode of audience reception" that is continually evolving and is without clear boundaries.  - Czechoslovakia or Czecho-Slovakia (Czech and , "esko-Slovensko") was a sovereign state in Central Europe that existed from October 1918, when it declared its independence from the Austro-Hungarian Empire, until its peaceful dissolution into the Czech Republic and Slovakia on 1 January 1993.  - Sydney Irwin Pollack (July 1, 1934  May 26, 2008) was an American film director, producer and actor. Pollack directed more than 20 films and 10 television shows, acted in over 30 films or shows, and produced over 44 films. His 1985 film "Out of Africa" won him Academy Awards for directing and producing; he was also nominated for Best Director Oscars for "They Shoot Horses, Don't They?" (1969) and "Tootsie" (1982), in the latter of which he also appeared.  - World War II (often abbreviated to WWII or WW2), also known as the Second World War, was a global war that lasted from 1939 to 1945, although related conflicts began earlier. It involved the vast majority of the world's nationsincluding all of the great powerseventually forming two opposing military alliances: the Allies and the Axis. It was the most widespread war in history, and directly involved more than 100 million people from over 30 countries. In a state of "total war", the major participants threw their entire economic, industrial, and scientific capabilities behind the war effort, erasing the distinction between civilian and military resources. Marked by mass deaths of civilians, including the Holocaust (in which approximately 11 million people were killed) and the strategic bombing of industrial and population centres (in which approximately one million were killed, and which included the atomic bombings of Hiroshima and Nagasaki), it resulted in an estimated 50 million to 85 million fatalities. These made World War II the deadliest conflict in human history.  - The Broadcasting Board of Governors (BBG) is an independent agency of the United States government. According to its website, its mission is to "inform, engage, and connect people around the world in support of freedom and democracy." The BBG supervises Voice of America (VOA), Radio Free Europe/Radio Liberty, Radio y Television Marti, Radio Free Asia, and the Middle East Broadcast Networks.  - The Communist Party of Czechoslovakia (Czech and Slovak: "Komunistická strana eskoslovenska", KS) was a Communist and MarxistLeninist political party in Czechoslovakia that existed between 1921 and 1992. It was a member of the Comintern. Between 1929 and 1953 it was led by Klement Gottwald. After its election victory in 1946 it seized power in the 1948 Czechoslovak coup d'état and established a one-party state allied with the Soviet Union. Nationalization of virtually all private enterprises followed.  - Prague is the capital and largest city of the Czech Republic. It is the 14th largest city in the European Union. It is also the historical capital of Bohemia. Situated in the north-west of the country on the Vltava river, the city is home to about 1.26 million people, while its larger urban zone is estimated to have a population of nearly 2 million. The city has a temperate climate, with warm summers and chilly winters.  - War Hunt is a 1962 war film starring John Saxon, Robert Redford and Charles Aidman. The film was directed by Denis Sanders, produced by his brother, Terry Sanders for T-D Enterprises, and released by United Artists.  - The Under Secretary for Public Diplomacy and Public Affairs is a position within the U.S. Department of State that is intended to help ensure that public diplomacy is practiced in combination with public affairs and traditional diplomacy to advance U.S. interests and security. The Under Secretary oversees three bureaus at the Department of State: Educational and Cultural Affairs, Public Affairs, and International Information Programs. Also reporting to the Under Secretary are the Office of Policy, Planning and Resources for Public Diplomacy and Public Affairs and the Advisory Commission on Public Diplomacy.  - Denis Sanders (January 21, 1929  December 10, 1987) was an American film director, screenwriter and producer who directed the debut performances of Robert Redford, George Hamilton, Sydney Pollack and Tom Skerritt in the 1962 film "War Hunt". He won two Academy Awards, the first for Best Short Subject in 1955 for "A Time Out of War" that had served as his master's degree thesis at U.C.L.A. and which he co-scripted with his brother Terry Sanders; and the second for Best Documentary in 1970 for "Czechoslovakia 1968".  - Terry Sanders (born December 20, 1931) is an American filmmaker having produced and/or directed more than 70 dramatic features, televisions specials, documentaries and portrait films. He co-heads the American Film Foundation and has produced and photographed the Oscar-winning dramatic short "A Time Out of War". He also received an Academy Award for Best Documentary Feature for "". He also produced and co-directed "Crime & Punishment, USA" with his brother Denis Sanders. The debuting actors in "War Hunt" are Robert Redford, Sydney Pollack, and Tom Skerritt, which he also produced with Denis Sanders.  - The Warsaw Pact, formally the Treaty of Friendship, Co-operation, and Mutual Assistance and sometimes, informally, WarPac. was a collective defense treaty among the Soviet Union and seven other Soviet satellite states in Central and Eastern Europe in existence during the Cold War. The Warsaw Pact was the military complement to the Council for Mutual Economic Assistance (CoMEcon), the regional economic organization for the communist states of Central and Eastern Europe. The Warsaw Pact was created in reaction to the integration of West Germany into NATO in 1955 per the London and Paris Conferences of 1954, but it is also considered to have been motivated by Soviet desires to maintain control over military forces in Central and Eastern Europe.  - The Prague Spring was a period of political liberalization in Czechoslovakia during the era of its domination by the Soviet Union after World War II. It began on 5 January 1968, when reformist Alexander Dubek was elected First Secretary of the Communist Party of Czechoslovakia (KS), and continued until 21 August when the Soviet Union and other members of the Warsaw Pact invaded the country to halt the reforms.  - The United States Information Agency (USIA), which existed from 1953 to 1999, was a United States agency devoted to public diplomacy. In 1999, USIA's broadcasting functions were moved to the newly created Broadcasting Board of Governors, and its exchange and non-broadcasting information functions were given to the newly created Under Secretary of State for Public Diplomacy and Public Affairs at the U.S. Department of State. The agency was previously known overseas as the United States Information Service (USIS).  - Film stock is an analog medium that is used for recording motion pictures or animation. It is a strip or sheet of transparent plastic film base coated on one side with a gelatin emulsion containing microscopically small light-sensitive silver halide crystals. The sizes and other characteristics of the crystals determine the sensitivity, contrast and resolution of the film. The emulsion will gradually darken if left exposed to light, but the process is too slow and incomplete to be of any practical use. Instead, a very short exposure to the image formed by a camera lens is used to produce only a very slight chemical change, proportional to the amount of light absorbed by each crystal. This creates an invisible latent image in the emulsion, which can be chemically developed into a visible photograph. In addition to visible light, all films are sensitive to X-rays and high-energy particles. Most are at least slightly sensitive to invisible ultraviolet (UV) light. Some special-purpose films are sensitive into the infrared (IR) region of the spectrum.    After reading the paragraphs above, we are interested in knowing the entity with which 'czechoslovakia 1968' exhibits the relationship of 'main subject'. Find the answer from the choices below.  Choices: - actor  - africa  - city  - cold war  - crime  - design  - diplomacy  - education  - election  - europe  - film  - film industry  - friendship  - hollywood  - hotel  - internet  - july  - london  - organization  - reality  - security  - soviet union  - the holocaust  - time  - vhs  - war  - west germany
Answer:
cold war