In 1978, a radical faction of the Afghan Communist Party seized power in a military coup. The 'Saur Revolution' carried out a whole series of progressive measures. The government passed decrees abolishing the selling of brides and giving equality to women. It announced a land reform and the cancellation of farmers’ debts. These measures met with the ferocious opposition of the powerful land owners and moneylenders. This article by Ted Grant, published in 1978, contains an analysis of the revolution, as well as the phenomena of colonial revolutions and proletarian bonapartism more generally. To mark the 40th anniversary of the 1978 revolution, we republish Grant's classic contribution.