Quote Originally Posted by Maciamo
So if a notorious holocaust denier visits Austria and does not raise the subject while in Austria, then nothing can be done against him/her ?
Most national legislations adhere to the territorial principle: all the crimes committed (by its own citizens or foreign nationals likewise) on national territories can be prosecuted. Some countries extend this principle and prosecute criminal cases committed by their own nationals in other countries (I'm aware of such regulations in regard to sexual crimes and sex tourism; but then again, these regulations are based on international agreements).

Prosecuting any kind of crime committed by any national anywhere is legally not feasible. If I'm not wrong, Belgium has/has had such a law in regard to human rights violations. Logically, the scope of criminal cases that can be brought in front of national courts has to be limited. For this reason and in the light of the territorial principle you can't do much against a law-abiding holocaust denier, unless there's an international arrest warrant for crimes committed elsewhere.