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.