They're generally used interchangeably, but sure, "antifa" stands for anti-fascist, which is what many anti-Trump protesters say they are.
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I easily can. Look at the numbers of people who attended any of several protest marches. The percentages are well below the numbers here.pic.twitter.com/HDepfuGZFq
Prove the people who attack the racists, along with those who tacitly support it, account for less than 50% of the counter-protesters.