(WWJ) A Hollywood actor who directed a film about union boss Jimmy Hoffa is speaking up in support of striking UAW members.

Danny DeVito tweeted Tuesday afternoon: "Support the UAW. GM needs to do the right thing for the 48 thousand employees on strike."

Support the UAW. GM needs to do the right thing for the 48 thousand employees on strike. — Danny DeVito (@DannyDeVito) October 8, 2019

DeVito made his 1992 bio-pic "Hoffa" about the former Teamsters union boss starring Jack Nicholson in the title role in Detroit. He's well-known for a range of acting roles including the villainous Penguin in Batman Returns; and more recently Frank on the TV comedy "It's Always Sunny in Philadelphia."

Earlier Tuesday, WWJ Auto Beat reporter Jeff Gilbert said that the pace of negotiations appears to be picking up as the UAW and General Motors work to end a strike that has lasted more than three weeks. "They're apparently exchanging proposals without some of the anger we saw over the weekend," Gilbert said.

Union leaders said they presented a proposal on Saturday, and that the company responded Sunday morning by reverting back to an offer that had been rejected, along with a few changes. As the strike goes on, layoffs of GM workers in Mexico and workers at suppliers continue.

There are also reports of delayed product launches, but GM says it's premature to talk about that.