Please answer the following question: Extract the answer to the question from the following context. Question: In which century did organized crime not fall in New York? Context: Organized crime has long been associated with New York City, beginning with the Forty Thieves and the Roach Guards in the Five Points in the 1820s. The 20th century saw a rise in the Mafia, dominated by the Five Families, as well as in gangs, including the Black Spades. The Mafia presence has declined in the city in the 21st century.
A:
20th century