 Complete the following phrase:  The Vinnytsia massacre was a mass execution of between 9,000 and 11,000 people in the Ukrainian town of Vinnytsia by the Soviet secret police NKVD during the Great Purge or Yezhovshchina in 19371938. Mass graves in Vinnytsia were discovered during Nazi Germanys occupation of Ukraine in 1943. The investigation of the site first conducted by the international Katyn Commission coincided with the discovery of a similar mass murder site of Polish prisoners of war in 