Four major performer unions — the Screen Actors Guild, the Major League Baseball Players Assn., Actors Equity, and the American Federation of Television & Radio Artists — will be touting the benefits of unions via Twitter during the Labor Day weekend.

Participants in the Labor Day Tweet-A-Thon include Tampa Bay Rays third baseman Evan Longoria, Minnesota Twins outfielder Michael Cuddyer, Texas Rangers pitcher C.J. Wilson, “CSI: NY” star Hill Harper, “Breaking Bad” star R.J. Mitte, Foo Fighters’ lead guitarist Chris Shiflett, and KCBS reporter Bob Butler.

The effort’s a joint project of American Rights at Work and the four unions.

“Labor Day is not a just a day to commemorate the protections, rights, and opportunities that labor unions and workers’ rights advocates have achieved in years past,” the orgs said. “It’s a day to broadcast the critical role unions play today for all workers — in showbiz — and in every industry.”

Butler said, “Being a union member takes the guesswork out of how I’m going to live in retirement.”

The Twitter posts will feature the tag #unionmember.

“I support unions and applaud their role in actively upholding the values of labor in America,” Mitte said. “A collective, unified voice is a powerful force and I am a proud SAG and AFTRA member.”