In October 2011, the FBI added Juggalos (followers of Insane Clown Posse) to its National Gang Threat Assessment (PDF).
From the report:
The Juggalos, a loosely-organized hybrid gang, are rapidly expanding into many US communities. Although recognized as a gang in only four states, many Juggalos subsets exhibit gang-like behavior and engage in criminal activity and violence. Law enforcement officials in at least 21 states have identified criminal Juggalo sub-sets, according to NGiC reporting.
NGiC reporting indicates that Juggalo gangs are expanding in New Mexico primarily because they are attracted to the tribal and cultural traditions of the Native Americans residing nearby.
Today, The A.V. Club reports that the Insane Clown Posse is "suing the FBI over the organization’s classification of Juggalos as a gang."
On Tuesday, the band’s lawyers filed suit against the FBI in U.S. District Court in Michigan “for failure to produce any documentary evidence in support of the FBI’s classification of the group’s fan base.” ... To date, thousands of Juggalos have filled out the questionnaire on Juggalos Fight Back, a website set up by ICP for fans to report “negative consequences” they’ve experienced at the hands of “law enforcement, border patrol, airline security, or other local, state, or federal governmental agency or employee.”