Disregard the wackos pictured above. They should not divert our attention from what antifa is, nor from its plans for our future.
antifa is an outright communist organization, with roots going back to pre-Nazi Germany in the 1930's.
Their goals should be obvious... create chaos leading to civil war and the overthrow of the U.S. government. As to the means, utilize "useful idiots" whenever possible to foment the discontent. You see that happening right now.
And do not make the mistake that a relatively small number of revolutionaries don't have the means to overthrow a government due to their lack of "public support". It was a very small group that successfully tossed out the Czarist government and seized power in their time.
Today, antifa has a much larger power base: that of a sizable portion of the entire democrat-communist party.
Scratch the skin of a "democrat", and you just might find a communist not far underneath...