Weren't the anti-nuke hippies already quite a force before that?
Pete Seeger wrote his anti-nuke spin-off of "Acres of Clams" in the 1970s I think.
Not specific to Germany but there's been a very vocal anti-nuke movement almost since the beginning. They were pretty successful in ending new nuclear generating plant construction in the USA also.
Yes, the free republic of wendland was established in 1980: https://en.wikipedia.org/wiki/Free_Republic_of_Wendland
The battle of brokdorf was also in the 80ies: https://www.helmut-schmidt.de/en/publications/detail/the-bat...