In January 1937, he appeared as a defendant alongside Yuri Pyatakov, Karl Radek and others at the second of three major Moscow show trials, where he confessed to having organised the explosion on Trotsky's orders, and pleaded with the court: "If you find it in the least possible to save me from shameful death, and, after putting me to the severest test, permit me to return to the ranks of the class from which I came, I shall regard it as my great and sacred duty fully to justify this gift.".