Which pair of leaders used political purges including the killing of opposition groups censorship and intimidation as a means of maintaining control of the governament?

Joseph Stalin in the Soviet Union and Mao Zedong in China both employed political purges, censorship, and intimidation to maintain control over their governments. Stalin's Great Purge targeted perceived political enemies and dissenters, resulting in widespread executions and imprisonment. Similarly, Mao's Cultural Revolution aimed to eliminate opposition, leading to violence against intellectuals and perceived counter-revolutionaries. Both leaders used these tactics to consolidate power and suppress any potential threats to their regimes.