No. Antifa is new and dangerous,
Antifa is not new at all. Antifa groups are older than I am. They first appeared in the 70s in Germany and Britain and spread to the US in the 80s. All that's new is that the US media seems to have recently picked up on, and become obessesed with, the word, (and comically mispronounce it).
In the US antifa groups traditionally used the term less as well, probably because there was less of a tradition of openly fascist groups in the US. But groups like Anti-Racist Action were just antifa by another name.