The Blue Army (Polish: Błękitna Armia), or Haller's Army, was the Polish army formed in France in the latter stages of World War I. The names come from the troops' French blue uniforms and the army's commander, General Józef Haller de Hallenburg. During the fighting on the Ukrainian front, individual soldiers of the Blue Army were involved in antisemitic violence, where political Jewish organizations found themselves sharing ideological platforms with Bolshevik Russia, as well as communist elements in Western Ukraine, and post war revolutionary Germany.