The raids were carried out with the support of several law enforcement agencies, and Eurojust -- the European agency that deals with judicial cross-border cooperation.

Police gave few other details about Tuesday's multi-nation operation, but earlier in the year, investigators said they had reason to believe that many of the militants behind the violent protests came from Italy and Spain.
[...]
A special task force has been combing through terabytes of police footage, CCTV recordings and private videos with the help of facial recognition software and geolocation data to track down the perpetrators.

archived
a libertarian group called the Black Blocs
so-called antifa modus operandi
"the affirmative consent and the special controls around sensitive types of technology like facial recognition that are required in GDPR "

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