During the Cold War, many countries pursued anti-communist policies.
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A loaded political term. Heavily associated with Cold War-era discourse: U.S.-led containment policies, the Kuomintang on Taiwan (反共抗俄, 'oppose communism, resist Russia'), and 1950s 反共救国 ('anti-communist national salvation') slogans.
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反 (anti-) + 共 (short for 共产 or 共产党, 'Communist Party'). The same 反X pattern produces 反美 (anti-American), 反日 (anti-Japanese), 反战 (antiwar).