The author provides a current state of knowledge on Sorbian anti-Nazi underground, which worked in cooperation with Polish military intelligence. He tries to contrast all the existing accounts and case studies available on the subject. The article presents the circumstances of cooperation of Polish intelligence with Sorbian activists and makes an attempt to present the organizational structure, its methods and the scope of activity. The author describes German repressions directed at the group members and the East German political police surveillance they were subjected to after the war.