listening to foreign stations became a criminal offence in nazi germany when the war began, while in some occupied territories, such as poland, all radio listening by non-german citizens was outlawed (later in the war this prohibition was extended to a few other occupied countries coupled with mass seizures of radio sets). penalties ranged from fines and confiscation of radios to, particularly later in the war, sentencing to a concentration camp or capital punishment. nevertheless, such clandestine listening was widespread in many nazi-occupied countries and (particularly later in the war) in germany itself. the germans also attempted radio jamming of some enemy stations with limited success.