Information:  - Salvatore `` Sammy the Bull '' Gravano ( born March 12 , 1945 ) is a former underboss of the Gambino crime family . He is known as the man who helped bring down John Gotti , the family 's boss , by agreeing to become an FBI informant . Originally a mobster for the Colombo crime family , and later for the Brooklyn faction of the Gambinos , Gravano was part of the group that murdered Gambino boss Paul Castellano . Gravano played a key role in planning and executing Castellano 's murder , along with John Gotti , Angelo Ruggiero , Frank DeCicco , and Joseph Armone . After Castellano 's death , Gotti elevated Gravano to underboss , a position he held at the time he became a government witness . At the time , Gravano was the highest - ranking member of the Five Families to break his Cosa Nostra oath and cooperate with the government . His testimony drew a wave of Cosa Nostra members to also become government witnesses .  - A crime family is a unit of an organized crime syndicate, particularly the Mafia (both in Sicily and in the United States), often operating within a specific geographic territory.  - John Joseph Gotti Jr. (October 27, 1940 ) was an Italian-American gangster who became boss of the Gambino crime family in New York City. Gotti and his brothers grew up in poverty and turned to a life of crime at an early age. Gotti quickly rose to prominence, becoming one of the crime family's biggest earners and a protégé of Gambino family underboss Aniello Dellacroce, operating out of the Ozone Park neighborhood of Queens.  - Queens is the easternmost and largest in area of the five boroughs of New York City. It is geographically adjacent to the borough of Brooklyn at the southwestern end of Long Island, and to Nassau County further east on Long Island; in addition, Queens shares water borders with the boroughs of Manhattan and the Bronx. Coterminous with Queens County since 1899, the borough of Queens is the second-largest in population (after Brooklyn), with a census-estimated 2,339,150 residents in 2015, approximately 48% of them foreign-born. Queens County also is the second-most populous county in the U.S. state of New York, behind the neighboring borough of Brooklyn, which is coterminous with Kings County. Queens is the fourth-most densely populated county among New York City's boroughs, as well as in the United States. If each of New York City's boroughs were an independent city, Queens also would be the nation's fourth most populous city, after Los Angeles, Chicago, and Brooklyn. Queens is the most ethnically diverse urban area in the world.    What is the relationship between 'sammy gravano' and 'sicily'?
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