Party leadership revocation and executions of those found guilty during the Moscow Trials was not a problem for Yezhov. Seeming to be a devout admirer of Stalin and not a member of the organs of state security, Yezhov was just the man Stalin needed to lead the NKVD and rid the government of potential opponents. Yezhov's first task from Stalin was to personally investigate and conduct prosecution of his long-time Chekist mentor Yagoda, which he did with remorseless zeal. Ordered by Stalin to create a suitably grandiose plot for Yagoda's show trial, Yezhov ordered the NKVD to sprinkle mercury on the curtains of his office so that the physical evidence could be collected and used to support the charge that Yagoda was a German spy, sent to assassinate Yezhov and Stalin with poison and restore capitalism. It is also claimed that he personally tortured both Yagoda and Marshal Mikhail Tukhachevsky to extract their confessions.