Too late, they were just labeled an extremist organization and are under surveillance:
https://www.dw.com/en/german-afd-party-labeled-extremist-by-domestic-intelligence-agency/a-72413346
Oh, that's nothing particularly new. Been going on in the eastern states for years. All part of the smear campaign I mentioned previously.
Here's how it works: The intelligence agency is subserviant to the interior minister, who is, of course, some leftist swine. The minister instructs the head of the security agency to find something, anything, that looks bad. Not too difficult in reality; there's always something to dig up. The press then has a field day and repeats the smears 24/7, and so do the leftist swine who ordered the report in the first place. And round and round it goes. All very totalitarian.
By now many, if not most, people see through the simplistic ruse and ignore it. Hence the new gain in popularity. Just wait until the economy starts to really hit the rocks, due to the idiotic green policies. When the pain hits hard, there might be a revolt in the air...