Nathan E. Brooks is a volunteer jailhouse minister who says he aggressively used the federal oppression statute when he was a practicing attorney. Today he is on the sunny walking bridge in downtown Chattanooga and is challenging SEI, the city’s contractor security company, to forbid him to strum his guitar, sing and accept donated coins and bills from members of the passing public. The security guard, who refused to give his name, says Mr. Brooks must obtain a busking permit. Mr. Brooks loudly denies this claim.