The cult hit rap-duo Insane Clown Posse has filed a lawsuit against the Federal Bureau of Investigations for classifying its fans as gang members, reports USA Today.

The band has about a million fans, according to the FBI. The agency classified the group as a gang in a 2011 report that noted crimes being committed by ICP fans, including assaults, robberies, murder, and child pornography.

The American Civil Liberties Union has joined the lawsuit on ICP's side, saying that "branding hundreds of thousands of music fans as gang members based on the acts of a few individuals defies logic and violates our most cherished of constitutional rights."