This year, when legislators in both houses of the U.S. Congress introduced resolutions calling upon the U.S. government to lead a global effort to halt and reverse the nuclear arms race, the action was largely a response to the efforts of the Back from the Brink campaign. Begun in 2017 by Physicians for Social Responsibility and the Union of Concerned Scientists, that campaign -- spurred on by an escalating nuclear arms race that is rapidly spiraling out of control -- has secured the endorsement of a significant number of major national organizations and government officials. And it has some prospects for success.