The German law says so. Perhaps they don't enforce it much but it's still the law: " Whosoever publicly or in a meeting approves of, denies or downplays an act

The German law says so. Perhaps they don't enforce it much but it's still the law: " Whosoever publicly or in a meeting approves of, denies or downplays an act committed under the rule of National Socialism of the kind indicated in section 6 (1) of the Code of International Criminal Law, in a manner capable of disturbing the public peace shall be liable to imprisonment not exceeding five years or a fine." [ https://en.wikipedia.org/wiki/Laws_against_Holocaust_denial#Germany https://en.wikipedia.org/wiki/Laws_against_Holocaust_denial#... ]