History: Life In The New York City, 19th Century, United States

Organized crime has long been associated with New York City, beginning with the Forty Thieves and the Roach Guards in the Five Points in the 1820s. The 20th century saw a rise in the Mafia dominated by the Five Families and they still are the largest and most powerful criminal organization in the city. Gangs including the Black Spades also grew in the late 20th century. As early as 1850, New York City recorded more than 200 gang wars fought largely by youth gangs. The most prominent gangs in New York City today are the Bloods, Crips, Latin Kings, and MS-13.
Education
The city's public school system, managed by the New York City Department of Education, is the largest in the United States. About 1.1 million students are taught in more than 1,200 separate primary and secondary schools. Charter schools, which are partly publicly funded, include Harlem Success Academy and Girls Prep. There are approximately 900 additional privately run secular and religious schools in the city. Though it is not often thought of as a college town, there are about 594,000 university students in New York City, the highest number of any city in the United States. In 2005, three out of five Manhattan residents were college graduates and one out of four had advanced degrees, forming one of the highest concentrations of highly educated people in any American city.