You can take snopes with a grain of salt if you like, but apparently it was a hoax.
I’ve heard two version of the story:
a) Soros is paying protesters ($ from the left).
b) an alt-right group was pretending to be a leftist protest group in order to make the left look bad and incite riots in order to force a police state
[I believed b) for a day or two because that’s one of their tricks – the “let’s make liberals look bad by pretending to be them” game]
but c) seems most likely, which would be what snopes says.