CARBONDALE, Ill. - Questions of academic freedom are simmering at Southern Illinois University after history professors criticized a colleague over his use of an article about black-on-white killings in San Francisco in the 1970s. History professor Jonathan Bean, a self-proclaimed "libertarian conservative," claims he is the victim of public attacks by a history department filled with professors who hold political views opposite his. His colleagues say they fault him for distributing to students what they call a "distorted and inaccurate" historical account of the so-called "Zebra" killings, a series of random street slayings of whites that terrorized San Francisco in...