The thing is the moment antifa is mentioned it is most definitely politics. Antifa as a single cohesive organisation doesn't exist, the fact they even considered it might do is a political position. What does exist is radical left organisations some of which cross the legal line, and these can be targeted by mutual legal assistance requests. It'll be interesting to see if anything actually comes of this or it's a damp squib, these groups, esp the more militant anti-capitalist lot have learned to practicing opsec the hard way, e.g. getting nicked.