YouTubeMore than 1.4 million Americans are wearing the colors of more than 33,000 gangs across the country, according to a report by the Federal Bureau of Investigation. AdvertisementBased on evidence from federal, state, local, and tribal law enforcement, the FBI says gangs commit 48% of violent crime, and are only becoming more dangerous. Some even source weapons from the military. While many of these groups are regional and only loosely organized, many gangs are expanding their ranks and establishing themselves at international levels.

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Organizations: YouTube, Federal Bureau of Investigation, FBI