Pastico Corporation hears through the “grapevine” that its employees are unhappy with the working conditions

Pastico Corporation hears through the “grapevine” that its employees are unhappy with the working conditions and wages being paid in the manufacturing plant are looking to bring in a union. In an effort to stop the plant’s unionization, Plastico posts a notice on the lunch room bulletin board stating that anyone found to be sympathetic to unions will be terminated. They also give all eligible employees who could join a union a pay raise. Are the actions by the company legal? Provide legal support for your response.