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, and formed alliances with other criminal enterprises. This included the Jewish mob, which was led by Meyer Lansky, who was the leading Jewish gangster of that period. From 1920 to 1933, U. S. Prohibition helped create a thriving black market in liquor, which the Mafia was quick to capitalize on. The borough experienced a sharp increase in crime during the post-war period. The murder rate in Manhattan hit an all-time high of 42 murders per 100,000 residents in 1979. Manhattan retained the highest murder rate in the city until 1985 when it was surpassed by the Bronx. Most serious violent crime has been historically concentrated in Upper Manhattan and the Lower East Side, though robbery in particular was a major quality-of-life concern throughout the borough. Through the 1990s and 2000s, crime in Manhattan plummeted in all categories versus historic highs. Today crime rates in most of Lower Manhattan, Midtown, the Upper East Side, and the Upper West Side are consistent with other major city centers in the United States. However, crime rates remain high in the Upper Manhattan neighborhoods of East Harlem, Harlem, Washington Heights, Inwood, and NYCHA developments across the borough despite significant reductions. In more recent years there has been an increase in violent crime, particularly in Upper Manhattan and NYCHA developments. Harlem Harlem, a large neighborhood within the northern section of the New York City borough of Manhattan, has historically had some of the highest rates of poverty and violent crime citywide. Although the rate of crime has decreased compared to historic highs of the early 1990s, high rates of crime are still prevalent in the neighborhood. Crime in Harlem is primarily related to illicit activities such as theft, robbery, drug trafficking and prostitution. Criminal organizations such as street gangs are responsible for a significant portion of crime, particularly violent crime. The leading cause of death among young black males in Harlem is homicide. According to a survey published in 2013 by Union Settlement Association, residents of East Harlem perceive crime as their biggest single concern. Harlem today maintains one of the highest violent crime rates in New York City. In 2021, the 25th Precinct had the second-highest