Much more so than previous works in the field of U.S. foreign relations, this article explores the relationship between the Helsinki Accords and peace activism in the United States. The article explains how well-known groups such as U.S. Helsinki Watch and lesser-known ones such as Campaign for Peace and Democracy West/East used the Helsinki Final Act when they challenged U.S. peace activists to defend the rights of imprisoned anti-nuclear activists in the Soviet bloc and to link the causes of peace and human rights. The article also demonstrates how the exchanges between U.S. human rights and anti-nuclear activists fit into transnational debates about linkages between the issues of human rights, peace, détente, and the “Helsinki process.”