About 20 people demonstrated at Klinec Electric Service and Manufacturing on Seminole Street in east Windsor on Thursday morning.
They say the company still owes a number of workers termination pay.
Last August, some employees quit after their wage was cut by 35 per cent.
The workers are not unionized. According to employees, they were told to sign a letter of agreement, which most refused to sign, or face immediate termination.
Last year, Paul Klinec, the owner of Klinec Manufacturing, said he was not willing to negotiate the wages, but was willing to discuss working conditions with someone representing the workers.
Thursday, he had no comment.
Paul Chislett speaks for the Windsor Worker Action Centre.
"We're going to continue to put the pressure on him to pay what he owes them," he said. "And then our other plans include talking to other suppliers and perhaps the ultimate users of these parts."
Some CAW members joined the protest Thursday. Tom Burke was one of them. He said it was important for him to take part.
"These people are in our community. Some of these people worked here for about 13 years. We just want to see that they get paid," he said. "They're Canadians, so we're here to support them in regards to that."