Antiwar activist Mark Colville was sentenced Friday to 21 months in federal prison for his role in a peaceful protest against U.S. nuclear weapons. He was the last of the so-called Kings Bay Plowshares 7 to be sentenced. In 2018, Colville and six other Plowshares activists broke into the Kings Bay Naval Submarine Base in Georgia with an indictment charging the U.S. government with crimes against humanity.