The Koliivshchyna was a major haidamaky rebellion that broke out in Right-bank Ukraine in June 1768, caused by money (Dutch ducats coined in Saint Petersburg) sent by Russia to Ukraine to pay for the locals fighting the Bar Confederation, the dissatisfaction of the peasants with the treatment of Eastern Catholics and Orthodox Christians by the Bar Confederation and the threat of serfdom and the opposition to the nobility and the Poles by the Cossacks and the peasants. The uprising was accompanied by violence against the members and supporters of the Bar Confederation, Poles, Jews and Roman Catholics and especially Uniate clergymen and culminated in the massacre of Uman. The number of victims is estimated from 100,000 to 200,000, because many communities of national minorities (such as Old Believers, Armenians, Moslems and Greeks) completely disappeared in the area of the uprising.