camp buka.ts, including the notorious abu bakr al baghdadi, the leader of isis. cnn's brian todd reports. >> reporter: he may be the most vicious terrorist leader in recent years, possibly more brutal than bin laden. now, a former inmate at a u.s.-run prison camp in iraq, says isis leader abu bakr al baghdadi, the man behind scores of isis beheadings, was once a trusted inmate by his american captors, allowed to roam freely around the camp. >> the americans seem to see abu bakr as somebody who could keep the prison quiet. there are 24 camps within the sunni side of the camp and he was allowed access to all of them. >> reporter: guardian reporter martin chulaw interviewed a senior isis commander, abu ahmed, not his real name. he told chulaw, baghdadi was a fixer at the camp. quote, he was respected very much by the u.s. army. abu bakr al baghdadi, he said, was seen by other detainees as clever, scheming, quote, using a policy of conquer and divide to get what he wanted. a u.s. intelligence offici