Undaunted, the B.S.U. members moved from the cafeteria to the Ole Miss campus-security office to file a complaint. “They handed each one of us a form, and we filled it out,” Mayfield said. “I put my name on the form,” he said, “and I wrote the source of my complaint, in bold print, as ‘racism.’ ” His classmates did the same. It was one of those balmy days in Mississippi in late winter, just before spring arrives. Again, white students happening past mostly ignored the protesters.