Wikipedia is a good starting point for a search, but this list is better.
We can learn from the Poles:
Article 13 of the Constitution of the Republic of Poland states:
Political parties and other organizations whose programs are based upon totalitarian methods and the modes of activity of nazism, fascism and communism, as well as those whose programs or activities sanction racial or national hatred, the application of violence for the purpose of obtaining power or to influence the State policy, or provide for the secrecy of their own structure or membership, shall be prohibited.