Optimum Movement

The Optimum Movement was a movement that came about during the mid 21st century on Earth, and spread to a number of nations - including Great Britain and the United States of America. They are believed to be one of the instigators behind the Third World War, and the following post atomic horror.

By the 2060s, Optimal forces had overthrown the British monarchy, capturing Queen Mary and holding her prisoner in London. Other members of the Royal Family were in hiding in Britain or abroad. In the United States, the Constitution of the United States was suspended by the Optimal government, and only 15 states under Optimal control were permitted to send Representatives to Congress.

Source

 * TOS novel Federation