America may be getting safer, but gangs are expanding and becoming more violent, posing a growing threat across the country, according to a 2011 FBI report.
An estimated 1.4 million Americans belong to 33,000 gangs, and together they are responsible for 48% of violent crime in the country.
Following up on a 2012 article, we have profiled 12 of the gangs mentioned in the report and noted their recent activity.