KABUL, Afghanistan — Five members of the Afghan Taliban who were freed from the U.S. military prison at Guantanamo Bay in exchange for captured American Army Sgt. Bowe Bergdahl have joined the insurgent group’s political office in Qatar, Taliban spokesman Zabihullah Mujahid said Tuesday. They will now be among Taliban representatives negotiating for peace in Afghanistan, a sign some negotiators in Kabul say indicates the Taliban’s desire for a peace pact. Others fear the five, all of whom were close to the insurgent group's founder and hard-line leader Mullah Mohammed Omar, bring with them the same ultra-conservative interpretation of Islam...