So looking around for a source other than Breitbart, I came up pretty scant, best I could find was from thelocal.de and I have no idea how trustworthy that is.
Apparently these pictures were published by "indymedia.org" relating to the G20 riots in Germany.
https://www.thelocal.de/20171218/far...of-them-online
Note that there is no reference to "antifa" (existence: tenuous) or "alt left" (existence: zero).
Stop reading garbage like Breitbart?
I mean, you could ban the alt-left, but they're such devious bastards they've gotten one step ahead of you by not existing.
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Baffling, isn't it? I mean, the entire left is alternative by definition.
The only conclusion you can draw from people using the term "alt left" is that (a) they don't know what "alt" means, and (b) they mindlessly throw anything they are accused of back at their accusers, regardless of how much sense it makes.
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I can see how that makes sense if you don't know what the word "alt" means.
Do you mean "fringe"? Because that word would work in that context. So why not use it, instead of talking gibberish?