The sister of an Iranian-American environmentalist made a plea for his release after two dual nationals including British-Iranian aid worker Nazanin Zaghari-Ratcliffe were allowed to leave the country this week. Taraneh Tahbaz told Reuters that her brother, Morad Tahbaz, who also holds British citizenship, had been taken back to prison on Friday after being released on furlough on Wednesday. Shortly afterwards, a spokesman for Britain’s foreign ministry said it had been told by Iran that Tahbaz, 66, had been taken back toEvin prison in order to fit an ankle bracelet and that he would be allowe…