When nurses from Blood Bank of the Redwoods set up their needles, blood machines and cartons of high-fructose juice at Sonoma State University last week, 94 students, faculty and staff members donated blood. Math professor Rick Luttmann was not one of them. He was ineligible, he said, because of a federal Food and Drug Administration ban on blood donations from men who had had sex with men. A ban that he said amounts to unlawful discrimination. Blood drives are the newest battleground for SSU faculty members who, led by Luttmann, are out to purge organizations on the 8,500-student campus they...