The United Soviet Socialist Republichttps://en.wikipedia.org/wiki/USSR_anti-religious_campaign_(1921%E2%80%931928)
The Soviet regime had an ostensible commitment to the complete annihilation of religious institutions and ideas. Militant atheism was central to the ideology of the Communist Party of the Soviet Union and a high priority of all Soviet leaders. Convinced atheists were considered to be more virtuous individuals than those of religious belief.
When church leaders demanded freedom of religion under the constitution, the Communists responded with terror. They murdered the metropolitan of Kiev and executed twenty-eight bishops and 6,775 priests. Despite mass demonstrations in support of the church, repression cowed most ecclesiastical leaders into submission.
The Nazi Regimehttps://en.wikipedia.org/wiki/Religion_in_Nazi_Germany#Plan_for_the_Roman_Catholic_ChurchAs Hitler rose to power, many Catholic bishops, priests, religious and lay leaders vociferously opposed Nazism on the grounds of its incompatibility with Christian morals. In early 1931, the German bishops issued an edict excommunicating all leaders of the Nazi Party and banned Catholics from membership.
In 1937 Pope Pius XI issued the encyclical Mit brennender Sorge condemning Nazi ideology. In 1941 the Nazi authorities decreed the dissolution of all monasteries and abbeys in the German Reich, many of them effectively being occupied and secularized by the Allgemeine SS under Himmler. Himmler saw a main task of the SS to be that of "acting as the vanguard in overcoming Christianity and restoring a Germanic way of living" as part of preparations for the coming conflict between "humans and subhumans". Hitler called a truce in the Church conflict with the outbreak of war, wanting to back away from policies likely to cause internal friction in Germany. He decreed at the outset of war that "no further action should be taken against the Evangelical and Catholic Churches
for the duration of the war".
Khmer_Rougehttps://en.wikipedia.org/wiki/Khmer_Rouge_period_(1975%E2%80%931979)#Religious_communitiesMany monks were executed; temples and pagodas were destroyed[14] or turned into storehouses or gaols. Images of the Buddha were defaced and dumped into rivers and lakes. People who were discovered praying or expressing religious sentiments were often killed. The Christian and Muslim communities also were even more persecuted, as they were labelled as part of a pro-Western cosmopolitan sphere, hindering Cambodian culture and society.
The Roman Catholic cathedral of Phnom Penh was completely razed.[14] The Khmer Rouge forced Muslims to eat pork, which they regard as forbidden (ḥarām). Many of those who refused were killed. Christian clergy and Muslim imams were executed. One hundred and thirty Cham mosques were destroyed.
Early Communist Chinahttps://www.mtholyoke.edu/~geary20d/worldpolitics/maozedeng.htmlDuring the beginning of the People’s Republic of China, Mao Zedong and the Communists had seized control and 10,000 missionaries were forced to leave the country. Persecution of Christians proceeded at full throttle. Mao Zedong did not want any foreign influence on the people. In 1952 the last U.S. Presbyterian missionaries, Frank and Essie Price, were forced to leave China a mere three years after Mao Zedong assumes power. During the dark years of Mao's 'Great Leap Forward' (launched in 1958) and 'The Great Proletarian Cultural Revolution' (launched in 1966), many of the Christian leaders were killed and imprisoned for their faith, and many others spent years in hard labor camps. According to an article in the Epoch Times, “The CCP (Chinese Communist Party) has lost all composure in the frantic persecution of religion. During the Cultural Revolution, numerous temples and mosques were torn down, and monks were paraded in humiliation through the streets