In early 1928 Stalin travelled to Novosibirsk, where he alleged that kulaks were hoarding their grain and ordered that the kulaks be arrested and their grain confiscated, with Stalin bringing much of the area's grain back to Moscow with him in February. At his command, grain procurement squads surfaced across Western Siberia and the Urals, with violence breaking out between these squads and the peasantry. Stalin announced that both kulaks and the "middle peasants" must be coerced into releasing their harvest. Bukharin and several other Central Committee members were angry that they had not been consulted about this measure, which they deemed rash. In January 1930, the Politburo approved the liquidation of the kulak class; accused kulaks were rounded up and exiled to other parts of the country or to concentration camps. Large numbers died during the journey. By July 1930, over 320,000 households had been affected by the de-kulakisation policy. According to Stalin biographer Dmitri Volkogonov, de-kulakisation was "the first mass terror applied by Stalin in his own country."