On January 25, 1943 a group of students — who had previously been refused membership of the communist resistance group due to the mistrust held by its members toward any elitism — set fire to a stock of German listening devices at Dansk Industrisyndikat in Hellerup using a bottle of spirit. The students were hereafter accepted into the group, and this caused a change of name from the original KOPA (Kommunistiske Partisaner, Communist Partisans) to BOPA. The new name was at first used jokingly by old members, but it soon became the most widely used name. The name was also changed because it were easier to obtain arms from the allies if you were not an openly communist resistance group.
Operations grew in magnitude as individuals with inside knowledge of possible targets joined the group. Especially young apprentices from large factories proved useful in identifying targets which were supplying the German military, and this resulted in attacks on factories such as Burmeister & Wain and Riffelsyndikatet in 1943, Riffelsyndikatet (again) and Global in 1944 and Always in 1945.