 Lutovinov also sent a controversial letter to comrades in the CP(B)U in the fall of 1920.In fall 1920, he served in a Party committee on trade unions, but fell into conflict with Leon Trotsky, who left the committee after serving briefly.Lutovinov did not sign the program of the Workers' Opposition in December 1920, but he remained a critic of Russian Communist Party policy on trade unions, workers, and the economy.