In 1948 Pechersky was arrested by the Soviet authorities along with his brother during the countrywide Rootless cosmopolitan campaign against the Jews suspected of pro-Western leanings. Only after Stalin's death in 1953 was he released from jail due in part to mounting international pressure. However, the harassment did not stop there. Pechersky was prevented by the Soviet government from testifying in multiple international trials related to Sobibor, including theEichmann Trial in Israel. The last time he was refused the permission to exit the country and testify was in 1987, for a trial in Poland.