I haven’t seen this quote from Thamas before. Was is part of the Citizen’s united ruling?
Mozilla’s Brendan Eich and gay marriage: Intolerance over tolerance?

The resignation of Eich, notes the Wall Street Journal’s James Taranto, ties back to the Supreme Court arguments over the Citizens United case, where the court ruled that political donations are protected speech under the First Amendment.

But Justice Clarence Thomas argued against allowing the disclosure of the names of private donors. Thomas pointed out how gay rights supporters used disclosure laws to create maps showing homes and businesses of those who supported the referendum. Some of those supporters were then targeted for protests, with several having to close businesses.

“The success of such intimidation tactics has apparently spawned a cottage industry that uses forcibly disclosed donor information to pre-empt citizens’ exercise of their First Amendment rights,” Justice Thomas wrote.