In 1922, he became a member of the Bulgarian Agrarian National Union (BANU), a party devoted to representing the causes of the Bulgarian peasantry. During the September Uprising Dimitrov organized a peasant revolt in the Lovech region to counter the coup d'état of 1923. He was imprisoned and may have been sentenced to death had it not been for his young age. After the St Nedelya Church assault in 1925, he was arrested again along with other opposition figures.