WASHINGTON -- Prompted by complaints that fundamentalist Islamic clerics are spreading an anti-U.S., potentially violent ideology in federal prisons, the Justice Department's inspector general is investigating how prison officials are selecting Muslim chaplains. The complaints, including some from moderate Islamic groups, focus on the U.S. Bureau of Prisons' policy of relying on endorsements from two organizations that critics say promote the hard-line viewpoints shared by Osama bin Laden and other anti-American, Muslim extremists. One of these groups is the Graduate School of Islamic and Social Sciences, whose Virginia offices were raided last year by Customs Service agents investigating possible financial...