The February Revolution in Russia officially ended a centuries-old regime of antisemitism in the Russian Empire, legally abolishing the Pale of Settlement. However, the previous legacy of antisemitism was continued and furthered by the Soviet state, especially under Joseph Stalin. After 1948, antisemitism reached new heights in the Soviet Union, especially during the anti-cosmopolitan campaign, in which numerous Yiddish-writing poets, writers, painters and sculptors were arrested or killed. This campaign culminated in the so-called Doctors' plot, in which a group of doctors (almost all of whom were Jewish) were subjected to a show trial for supposedly having plotted to assassinate Stalin. Although repression eased after Stalin's death, persecution of Jews would continue until the late 1980s (see: refuseniks). Under the Tsars, Jews – who numbered approximately 5 million in the Russian Empire in the 1880s, and mostly lived in poverty – had been confined to a Pale of Settlement, where they experienced prejudice and persecution, often in the form of discriminatory laws, and they had often been the victims of pogroms, many of which were either organized or tacitly approved of by the Tsarist authorities. In response to the oppression which they were being subjected to, many Jews either emigrated from the Russian Empire or joined radical political parties, such as the Jewish Bund, the Bolsheviks, the Socialist Revolutionary Party, and the Mensheviks. There were also numerous antisemitic publications of the era which gained widespread circulation. The Russian Provisional Government cancelled all restrictions imposed on the Jews by the tsarist government, in a move parallel to the Jewish emancipation in Western Europe that had taken place during the 19th century abolishing Jewish disabilities. The October Revolution saw the Bolsheviks seize power in a coup. They were strongly opposed to Judaism (and indeed to any religion) and conducted an extensive campaign to suppress the religious traditions among the Jewish population, alongside the traditional Jewish culture.