The Leningrad Affair followed Zhdanov's death in 1949, and one explanation was that Beria encouraged Stalin to purge Leningrad because it contained a group of senior officials, rivals to Stalin
1. Imprisoned or sacked the wives and daughters of senior figures in government
2. Example: Stalin demanded the Politburo expel Molotov's wife from the Party, Molotov abstained but later apologised, in 1949 Stalin had Molotov's wife arrested and imprisoned