As Italian immigration grew in the early 20th century many joined ethnic gangs, including Al Capone, who got his start in crime with the Five Points Gang. The Mafia (also known as "Cosa Nostra") first developed in the mid-19th century in Sicily and spread to the East Coast of the United States during the late 19th century following waves of Sicilian and Southern 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.