Conservatives are learning the hard way that joking about union organizing is no laughing matter.

Commentator Ben Shapiro’s tongue-in-cheek tweet last year about striking employees spurred a federal complaint that touched off a seven-month investigation by the National Labor Relations Board, which ultimately dismissed the matter in a decision announced Monday.

What was the tweet? Referring to Spotify staffers threatening to strike over comedian Joe Rogan’s show, Mr. Shapiro, founder of The Daily Wire, tweeted, “I have a message for DW employees. If you ever try anything like this, you can consider your strike permanent.”

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