General Motors has fired three UAW workers at Flint Assembly Plant for threats of violence during the strike as well as acts of violence.

About 46,000 UAW members went on a nationwide six-week strike starting Sept. 16 and ending with ratification of a four-year contract on Oct. 25.

A person familiar with the terminations said the people involved either made threats or actually committed acts of violence while on the picket line during the strike. The three people were dismissed from Flint Assembly over the weekend, this person said.

"It ties to bomb threats and threats of actual violence made on the line," said the person. "The actual violence itself on the picket line had to do with a smashed windshield. It is all a clear violation of company policy."

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GM builds its heavy-duty GMC Sierra and Chevrolet Silverado pickups at Flint Assembly.

In a media statement Monday, GM said, “We can confirm the employees have been dismissed from Flint Assembly due to violations of company policy. Our team members play a critical role in our success, and the new four-year labor agreement recognizes those important contributions with an industry-leading wage and benefit package. As we restart operations, we are moving forward as one team and staying focused on our priorities of safety and building high quality vehicles for our customers.”

A spokesman for the UAW said all issues will be addressed through local UAW leaders and "our contracts' grievance process, which applied during the work stoppage."

According to two workers at Flint Assembly, one of the fired workers had posted on social media earlier this month, "General Motors is sneaking in scabs to run the body shop. Need all people (out) there to stop them. Bring your ball bats, numb chicks (sic) and night sticks. It's time to step this up. It's time to get some national headlines coverage and turn the tables on Mary Barra. Be there and bring a friend."

As for the actual violence, one Flint worker said there were "a couple of fights" on the picket line, but she did not know the details.

"Our chairman put on our Local 598 App that the people who were discharged have been told and the union is working with them to write a grievance. You have to write a grievance because that's how you get your job back," said the worker.

The chairman of Local 598, which represents some 4,800 hourly workers at Flint, was not immediately available for comment.

During the strike, GM's Spring Hill Assembly plant also had some problems with workers on the picket line, including criminal charges in an incident that involved a shattered windshield. GM declined to comment whether it will take more action against union workers who violated company policy.

Maury County sheriff's deputies in Tennessee arrested nine protesters in a separate incident Sept. 18 when they refused to stop blocking a plant entrance.

GM got a court order to restrict picketers' actions in Spring Hill.

"After dialogue failed to stop the incidents of harassment, violence and vandalism by a few people, we had to take necessary actions to protect everyone involved," GM said at the time.

More:GM gets court to keep UAW picketers from blocking Spring Hill Assembly entrances

More:UAW striker dies after being struck by car on picket line at Tennessee GM plant

GM builds the GMC Arcadia SUV and the Cadillac XT5 and XT6 SUVs at Spring Hill. It also builds the 6.2L V8 engine that powers Chevrolet Tahoe, GMC Yukon, GMC Yukon XL and Cadillac Escalade full-size SUVs; as well as the all-new Cadillac 2.0L T, 2020 GMC Acadia 2.0 L T and Chevrolet and GMC 2.7.

Contact Jamie L. LaReau at 313-222-2149 or jlareau@freepress.com. Follow her on Twitter @jlareauan. Read more on General Motors and sign up for our autos newsletter.