Eastern Bloc governments did not use jammers to prevent people from listening to Radio Luxembourg, but did do so for Radio Free Europe and, since the stations used harmonic frequencies (1439 kHz for Luxembourg and 719 kHz for Free Europe), the jamming also affected Radio Luxembourg's signal.
Governments in Eastern Europe, which were under communist rule, did not use jammers to prevent people from listening to Radio Luxembourg, but they did employ jamming methods against Radio Free Europe. As a result, both stations' signals were affected due to their similar frequencies (1439 kHz for Luxembourg and 719 kHz for Free Europe).