 Complete the following phrase:  The area that would become Transnistria was organized into the Ukrainian SSR in 1919, under which the Moldavian Autonomous Soviet Socialist Republic MASSR was created in 1924. Under Stalinist rule, the Polish community would decline further. After a brief initial period of liberalization and freedom towards Poles in the Soviet Union were subject to harassment, dispersal and mass terror. This trend increased in the late 1930s, as a result of the 1937-8 