In the 1930s, Stalin who was preparing the USSR for the next world war unleashed terror
through the NKVD and the GPU, which had no precedent in Russia's history. The communists
themselves, including the Polish ones, were also affected by the purges. In 1937 Stalin signed
a motion to "cleanse" the Communist Party of Poland. Almost all the activists of the Polish
Civic Platform who were in the USSR at that time were imprisoned, sent to the camps or shot.
Finally, the CPP was dissolved by Komintern on 16 August 1938.