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 Luciano's rise to power by reportedly organizing the 1931 murders of Mafia bosses Joe Masseria and Salvatore Maranzano. By 1936, Lansky had established gambling operations in Florida, New Orleans, and Cuba. These gambling operations were successful as they were founded upon two innovations: There was also an absolute rule of integrity concerning the games and wagers made within their establishments. Lansky's "carpet joints" in Florida and elsewhere were never "clip-joints" where gamblers were unsure of whether or not the games were rigged against them. Lansky ensured that the staff administering the games consisted of men of high integrity. In 1946,