non-union worker

A worker who isn’t supported by a labour union, and thus doesn’t have a union to negotiate employment terms, wages, benefits, workplace health and safety, job training and other work-related issues, on their behalf.

“Why is Jimmy working so many hours of overtime without pay?”
“He’s a non-union worker, which means that he doesn’t have a labour union to represent him, so he doesn’t really have that much of a choice, currently.”