MIAMI (AP) — Federal prosecutors are seeking to revoke the U.S. citizenship of former U.S. Ambassador Manuel Rocha, the imprisoned former diplomat who served as a secret agent for Cuba dating back to the 1970s in one of the longest-running betrayals in the history of the foreign service. The U.S. Attorney’s Office in Miami filed a civil denaturalization complaint Thursday that would complete the Colombian-born Rocha’s fall from grace, stripping him of the citizenship he attained after moving to