On February 10, 1941, a conference for OUN leadership was held in Kraków, Poland. Since 1939, Andriy Atanasovych Melnyk, a founder of the OUN, had been placed at its head. He had been chosen for his more moderate and pragmatic stance; his supporters admired Mussolini's fascism but condemned Nazism. However, a younger and more radical Nazism-supporting faction of the OUN were dissatisfied. It was at this conference that the schism solidified. This radical Nazism-supporting contingent of the OUN refused to accept Andriy Atanasovych Melnyk as head of the OUN and instead named Bandera. This led to the split of the OUN in the spring of 1941 into two groups: OUN-B (Banderites), who were more militant, younger and supported Bandera, and OUN-M (Melnykites), who were generally older and more ideological. In February 1941, several months before the German attack on the USSR, Bandera became the leader ("Providnyk") of the OUN-B faction, or the Banderivtsi. Five months later, in July 1941, Bandera himself was arrested and sent to a concentration camp in Germany. He was imprisoned there until 1944.