Here is the opinion in In re Tam:

In re Tam

An excerpt:

Section 2(a) of the Lanham Act bars the Patent and Trademark Office (“PTO”) from registering scandalous, immoral, or disparaging marks. 15 U.S.C. § 1052(a). The government enacted this law—and defends it today— because it disapproves of the messages conveyed by disparaging marks. It is a bedrock principle underlying the First Amendment that the government may not penalize private speech merely because it disapproves of the message it conveys. That principle governs even when the government’s message-discriminatory penalty is less than a prohibition.

Courts have been slow to appreciate the expressive power of trademarks. Words—even a single word—can be powerful. Mr. Simon Shiao Tam named his band THE SLANTS to make a statement about racial and cultural issues in this country. With his band name, Mr. Tam conveys more about our society than many volumes of undisputedly protected speech. Another rejected mark, STOP THE ISLAMISATION OF AMERICA, proclaims that Islamisation is undesirable and should be stopped. Many of the marks rejected as disparaging convey hurtful speech that harms members of oft-stigmatized communities. But the First Amendment protects even hurtful speech.

The government cannot refuse to register disparaging marks because it disapproves of the expressive messages conveyed by the marks. It cannot refuse to register marks because it concludes that such marks will be disparaging to others. The government regulation at issue amounts to viewpoint discrimination, and under the strict scrutiny review appropriate for government regulation of message or viewpoint, we conclude that the disparagement proscription of § 2(a) is unconstitutional. Because the government has offered no legitimate interests justifying § 2(a), we conclude that it would also be unconstitutional under the intermediate scrutiny traditionally applied to regulation of the commercial aspects of speech.