Walter Krivitsky
Walter Germanovich Krivitsky (Russian: Ва́льтер Ге́рманович Криви́цкий; born Samuel Gershevich Ginsberg; Russian: Самуил Гершевич Гинзберг; June 28, 1899 – February 10, 1941) was a Soviet military intelligence spymaster who defected to the West and revealed plans for the signing of the Molotov–Ribbentrop Pact. == Early life == Walter Krivitsky was born on June 28, 1899, to Jewish parents as Samuel Ginsberg in Podwołoczyska, Galicia, Austria-Hungary (now Pidvolochysk, Ukraine).