WASHINGTON — After three days on the run, Ahmad Batebi picked his way down a rocky slope to the stream that marked Iran’s border with Iraq. His Kurdish guides, who had led Mr. Batebi, an Iranian dissident, through minefields and dodged nighttime gunfire from border guards, passed him to a new team of shadowy human smugglers. At the age of 31, after nearly eight years in Iranian prisons, subjected to torture and twice taken to the gallows and fitted with a noose, Mr. Batebi had fled. ... Instead, Mr. Batebi, one of Iran’s best-known dissidents, received permission to enter the...