Washington (CNN) The Supreme Court struck down Monday a provision of federal law that prohibits the registration of "immoral" or "scandalous" trademarks as a violation of the First Amendment.

The justices' ruling clears the way for a clothing designer to apply for a federal trademark for his clothing line called FUCT

The ruling, which was unanimous in part and 6-3 in part, could open the doors to more requests to register words or phrases that have been considered vulgar, a concern that the court's minority feared.

"We hold that this provision infringes the First Amendment," Justice Elena Kagan wrote in the majority opinion, because it "disfavors certain ideas."

Entrepreneur Erik Brunetti said he founded a clothing brand in 1990 to question authority and the assumptions of society. He said his company's name stands for "FRIENDS U CAN'T TRUST."

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