Barzan Ibrahim Hasan al Tikriti, Saddam Hussein's half brother, was one of 55 senior Iraqi figures wanted by the United States. (AP Photo/Department of Defense)Saddam’s Half Brother Talking to U.S. Captors; Federal Agents Head to Iraq B A G H D A D, Iraq, April 18 — Saddam Hussein's half brother, the one-time head of Iraq's feared intelligence agency, is talking to his U.S. captors, ABCNEWS has learned. U.S. officials hope to learn the whereabouts of senior regime figures, as well as information about suspected weapons programs, from Barzan Ibrahim Hasan al Tikriti, sources said. His capture in Baghdad was...