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I did an entire undergrad thesis on the groups that come in to protest in Portland. "Far right" usually refers to people who believe things outside of traditional mainstream Republican thought as curated by establishment institutions, especially magazines like The National Review
I recommend "Right-Wing Critiques of American Conservatism" by George Hawley to learn why Trump's platform falls under the label "far right." David Neiwert has done some great writing on the so-called "Patriot" groups of the Pacific Northwest who often come to downtown Portland
