Topchiev has copied this letter to Powell, Rotblat, Glass and Brown, and BR, whose name is underlined, though it opens with "Dear Professor Rabinowitch".

He writes on behalf of the Soviet Scientists' Pugwash Group, regarding the US's recent action against the Soviets by sending their military reconnaissance plane into "... air space of the USSR." [This refers to the U2 incident.]

"All our people and the Soviet scientists as well strongly condemn such aggressive actions of the USA government and we regard them as a very dangerous threat to a world peace. We believe that all those who treasure the cause of peace will not remain indifferent under such circumstances."