Slave-trade was one of the main factors in the system of complicated and contradictory interactions between the peoples of the North Caucasus, Transcaucasia, and Russia. Everlasting inter-ethnic clashes and wars, political instability, great demand and high prices for 'human commodities' strongly promoted the growth of this business in Dagestan and in the North Caucasus in general. The feudal lords used to organise "commercial" campaigns, aimed at capturing people and getting ransom. For centuries, this cruel industry had remained one of the dominating elements in the economy of this multi-ethnic region. The paper, based mainly on the archive documents, offers a short history of slave-trade in Dagestan up to its final abolishment in the 60-s of the 19th century.