During the war, the NSZ fought the Polish communists, including their military organizations such as the Gwardia Ludowa (GL) and the Armia Ludowa (AL). After the war, former NSZ members were persecuted by the newly installed communist government of the Polish People's Republic. Reportedly, communist partisans engaged in planting false evidence, such as documents and forged receipts at the sites of their own robberies, in order to blame the NSZ. It was a method of political warfare practiced against the NSZ also by the Ministry of Public Security of Poland and Milicja Obywatelska (MO) right after the war, as revealed by communist Poland's court documents.