Stand Together Music, part of rightwing billionaire Charles Koch’s advocacy network, collaborates with Pitbull, Machine Gun Kelly and others

Last September, the rapper Killer Mike was DJing hip-hop classics like Snoop Dogg’s Ain’t No Fun at a music festival afterparty in Louisville, Kentucky. “The inspiration for the night’s set is freedom of speech, so say what the fuck you want!” he told a crowd of hundreds. Killer Mike, half of the duo Run The Jewels, is known for speaking out against police brutality and racial injustice, as well as campaigning for Bernie Sanders.

But this night’s set was co-sponsored by Stand Together Music, an organization backed by the libertarian billionaire Charles Koch, who made his fortune in fossil fuels. Other sponsors of the party included the free-speech group Fire (which has received millions of dollars in contributions from the Charles G Koch charitable foundation), as well as the music outlet Spin, an official partner of Stand Together Music.