 The two largest underground publishers were the Bureau of Information and Propaganda of Armia Krajowa and the Government Delegation for Poland . <unk> <unk> <unk> <unk> ( Secret Military Publishing House ) of Jerzy <unk> ( subordinated to the Armia Krajowa ) was probably the largest underground publisher in the world . In addition to Polish titles , Armia Krajowa also printed false German newspapers designed to decrease morale of the occupying German forces ( as part of Action N ) . The majority of Polish underground presses were located in occupied Warsaw ; until the Warsaw Uprising in the summer of 1944 the Germans found over 16 underground printing presses ( whose crews were usually executed or sent to concentration camps ) . The second largest center for Polish underground publishing was Kraków . There , writers and editors faced similar dangers : for example , almost the entire editorial staff of the underground satirical paper Na <unk> was arrested , and its chief editors were executed in Kraków on 27 May 1944 . ( Na <unk> was the longest published Polish underground paper devoted to satire ; 20 issues were published starting in October 1943 . ) The underground press was supported by a large number of activists ; in addition to the crews manning the printing presses , scores of underground <unk> distributed the publications . According to some statistics , these <unk> were among the underground members most frequently arrested by the Germans . 
