(April 24, 2011) Abu Sufian Ibrahim Ahmed Hamuda bin Qumu was a prisoner at the Guantánamo Bay prison, judged “a probable member of Al Qaeda” by the analysts there. They concluded in a newly disclosed 2005 assessment that his release would represent a “medium to high risk, as he is likely to pose a threat to the U.S., its interests and allies.” Today, Mr. Qumu, 51, is a notable figure in the Libyan rebels’ fight to oust Col. Muammar el-Qaddafi, reportedly a leader of a ragtag band of fighters known as the Darnah Brigade for his birthplace, this shabby port...