The @CCC, Europe's largest association of hackers, has updated its "Unvereinbarkeitserklaerung":

https://www.ccc.de/en/club/unvereinbarkeitserklaerung-des-ccc

Excerpt:
„Those who aim to destroy coexistence in society and work toward an alternative society with principles based on chauvinism and nationalism are working against the moral principles that unite us as a club.

The CCC declares representing racism and fascism, as well as trivialising historical and current violence, to be incompatible with a membership in our ranks.“