Here's a friendly Thanksgiving reminder from the D.C. Circuit Court of Appeals and the National Labor Relations Board (NLRB): Disciplining an employee for being an outspoken union supporter is an unfair labor practice.
Manor Care of Easton, Pennsylvania clearly does not want its employees to unionize; the nursing home disciplined one of its employees, "outspoken union supporter" Trisha Miechur, after she started promoting unionization at work.

