Midwestern authorities really don't like Chief Keef -- there are warrants for his arrest in the region, while Chicago Mayor Rahm Emanuel has gone so far as to say the young man "promotes violence" when he performs. And apparently, that public safety concern also covers virtual performances. Police in Hammond, Indiana shut down a surprise holographic Keef concert (technically, a Pepper's Ghost trick) this weekend despite the flesh-and-bone star being 2,000 miles away in Beverly Hills, California. Officials had warned that they would clamp down if they saw Keef play, but a festival promoter argues that they didn't have a "real reason" why a hologram wasn't allowed -- especially since the musician was fundraising for victims of violence.