Lawyers for rap-metal duo Insane Clown Posse have filed a lawsuit in Michigan seeking documents that would explain why the FBI considers its fans a gang.

The federal lawsuit says the FBI failed to timely respond to a 2011 request under the Freedom of Information Act.

Insane Clown Posse fans are known as Juggalos. Last year, the FBI included Juggalos in its national report on gangs.