A Casper man walking home from work one evening in 1923 was stopped by his neighbor, who held up a whistle. “If I was to blow this whistle once right now,” the neighbor said, “I would have fifty members here within two minutes.” The man believed him. “Klansmen were everywhere,” he later recalled. The neighbor was a Ku Klux Klan recruiter. The man he was trying to recruit was Bob David, whose unpublished memoir — now in the Casper College archive…