History Contemporary activities: 1990–present http://en.wikipedia.org/wiki/Gangs_in_the_United_States [en] United States gang violence Other ethnic gangs Postwar growth and change: 1940–1990 U.S. Street Gang Early street gangs in the Northeast: 1780–1870 Gangs in the United States United States U.S. Street Gang criminal gangs United States Hispanic gangs Gangs in the United States Gang membership in the military Female gang membership 33,000 gangs 1.4 million members of over 33,000 US gangs Demographics 1.4 million United States gangs Gangs in the United States https://en.wikipedia.org/wiki/Gangs_in_the_United_States US street gangs 1.4 million gang members mostly made up of people of color United States Reemergence and growth: 1870–1940 33,000 active gangs