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 built along the docks in New York Harbor. German submarines were sinking Allied shipping in great numbers along the eastern seaboard and the Caribbean coast, and there was great fear of attack or sabotage by Nazi sympathizers. Lansky connected the ONI with Luciano, who reportedly instructed Joseph Lanza to prevent sabotage on the New York waterfront. Lansky attended a secret meeting in Havana in 1946 to discuss Siegel's management of the Flamingo Hotel, which was running far behind schedule and costing Siegel's Mafia investors a great deal of money. While the other bosses wanted to kill Siegel, Lansky begged them