White supremacist groups are increasingly using propaganda like fliers and posters to spread bigoted messages on college campuses, a new report by the Anti-Defamation League found.  In the past academic year, 292 such incidents were reported — a 77 percent increase from the previous year, according to the report, which was released on Thursday. The stickers, banners and other physical materials included racist and anti-Semitic messages and often targeted Muslims, nonwhite immigrants and L.G.B.T. people.