WASHINGTON (AP) — Erik Brunetti's four-letter fashion brand starts with an "F'' and rhymes with "duct." The federal government calls it "scandalous" and "immoral" and has refused to register the trademark. Brunetti has a different word for his brand and designs: "thought-provoking."

"We wanted the viewer to question it: Like, is that pronounced the way I think it's pronounced?" he said of his streetwear brand "FUCT," which began selling clothing in 1991.

On Monday, the Supreme Court will hear Brunetti's challenge to a part of federal law that says officials should refuse to register trademarks...