Manhattan Italian emigration. Lucky Luciano established Cosa Nostra in Manhattan, forming alliances with other criminal enterprises, including the Jewish mob, led by Meyer Lansky, the leading Jewish gangster of that period. From 1920–1933, Prohibition helped create a thriving black market in liquor, upon which the Mafia was quick to capitalize. As in the whole of New York City, Manhattan experienced a sharp increase in crime during the 1960s and 1970s. Since 1990, crime in Manhattan has plummeted in all categories tracked by the CompStat profile. A borough that saw 503 murders in 1990 has seen a drop of nearly 88% to
Meyer Lansky on materials for hotel construction and Cuban contractors with the right "in" made windfalls by importing much more than was needed and selling the surplus to others for hefty profits. It was rumored that besides the $250,000 to get a license, sometimes more was required under the table. Periodic payoffs were requested and received by corrupt politicians. Lansky set about reforming the Montmartre Club, which soon became the "in" place in Havana. He also long expressed an interest in putting a casino in the elegant Hotel Nacional, which overlooked El Morro, the ancient fortress guarding Havana harbor. Lansky planned to