The Supreme Court on Tuesday invalidated federal limits on how much political parties can spend in coordination with candidates for public office, in a 6-3 ruling that overturned a restriction dating to a 1974 campaign finance law. Justice Brett Kavanaugh, writing for the majority in NRSC v. FEC, said that for nearly 200 years after ratification of the First Amendment, parties could spend freely to support their candidates and do so in coordination with them. The decision removes a longstanding constraint on coordinated party spending and adds to the court’s broader trend of narrowing campaign-finance restrictions.