Albert Einstein Einstein did not return to Germany. He settled in the United States and became an American citizen in 1940. On the eve of World War II, he endorsed a letter to President Franklin D. Roosevelt alerting him to the potential development of "extremely powerful bombs of a new type" and recommending that the US begin similar research. This eventually led to the Manhattan Project. Einstein supported the Allies, but he generally denounced the idea of using nuclear fission as a weapon. He signed the Russell–Einstein Manifesto with British philosopher Bertrand Russell, which highlighted the danger of nuclear weapons. He was
Albert Einstein Institution use of nonviolent action". To further this mission, the Institution has supported research projects; actively consulted with resistance and pro-democracy groups from Burma, Thailand, Egypt, Tibet, Serbia, Equatorial Guinea, the Occupied Palestinian Territories, and elsewhere; and worked to publicize the power and potential of nonviolent struggle around the world through educational materials, scholarly writings, workshops, and the media. The Albert Einstein Institution was founded in 1983 and operates out of a small office in East Boston, Massachusetts. A feature documentary by Scottish director, Ruaridh Arrow, "How to Start a Revolution", about the global influence of the Albert Einstein Institution and