So there is a known terrorist, Hamlili, who was released from Guantanamo Bay Prison facility back to his native Algeria. He is allegedly responsible for several terrorist attacks including the bombing of the Karachi Sheraton which killed 13 people in 2002.
Wikileaks released the files of 759 Guantanamo detainees, in which they describe Hamlili as an "Al-Qaeda Assassin". Things get interesting, however, when US interrogators believe that he was also an informant for MI6.
Anyways, it is currently unclear whether this man is still being detained in Algeria, so I'd like to give a round of applause to Mr. Obama for letting him go. When this guy bombs another hotel, church, etc, killing women and children I hope Obama can't sleep at night.