Pugwash Conferences on Science and World Affairs is an international organization that brings together scholars and public figures with the goal of reducing the danger of armed conflict and to seek solutions to global security threats. It was founded in 1957 by Joseph Rotblat and Bertrand Russell in Pugwash, Nova Scotia, Canada.
According to their website:
The mission of the Pugwash Conferences on Science and World Affairs is to bring scientific insight and reason to bear on namely, the catastrophic threat posed to humanity by nuclear and other weapons of mass destruction.
Pugwash and its co-founder, Sir Joseph Rotblat, were jointly awarded the 1995 Nobel Peace Prize "for their efforts to diminish the part played by nuclear arms in international politics and, in the longer run, to eliminate such arms."