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I suppose he means things like G20 violence in Hamburg a year ago. That included e.g. trying to kill and harm police officers.

So (after reading the article), how is that in any way connected to the people impacted by the actions described here?

They sent donations to a free email service that the people calling for violent action against AfD happened to use. That's literally it.

And how's that related to CCC?

A local branch of them was affected, too. Police did not care much whose rooms/buildings to raid.

The CCC have colaborated with extremists for some time.