Following the overthrow of the Tsar Nicholas II in March 1917, Georgia's bishops unilaterally restored the autocephaly of the Georgian Orthodox Church on 25 March 1917. These changes were not accepted by the Russian Orthodox Church. After the Red Army invasion of Georgia in 1921, the Georgian Orthodox Church was subjected to intense harassment. Hundreds of churches were closed by the atheist government and hundreds of monks were killed during Joseph Stalin's purges. The independence of the Georgian Orthodox Church was finally recognized by the Russian Orthodox Church on 31 October 1943: this move was ordered by Stalin as part of the war-time more tolerant policy towards Christianity in the Soviet Union.