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Acting as a deputy Commissar of Defense, he was strongly in favor of modernization and mechanization of the army, against the opinions of supporters of the old style of warfare, such as Semyon Budyonny.
During the Great Purges, he was accused of plotting a coup. On May 26, 1937, Marshal Tukhachevsky and Commanders Iona Emmanuilovich Yakir, Ieronim Petrovich Uborevich, Robert Petrovich Eideman, Avgust Ivanovich Kork, Vitovt Kazimirovich Putna, B.M.Feldman and Vitali Markovich Primakov were secretly arrested and tried by a military tribunal for anti-Communist conspiracy within the Army. They were executed on June 11.
Tukhachevsky and others were rehabilitated posthumously following Nikita Khrushchev's denunciation of Stalin's cult of personality.