Original sentence: The public advocacy of theories denying the Holocaust is a crime in some European countries (including France, Poland, Austria and Germany)
Edited sentence: The public advocacy of theories denying the Holocaust is a crime in some European countries (including France, Poland, Austria and Germany), but even in countries whose free-speech allow discussion of the topic, it is generally considered the strongest taboo, the topic frequently disallowed or punished in University campuses, revisionist meetings picketed and protested, and the revisionists themselves often threatened with violence or professional ruin