JACKSON, MS—The National Labor Relations Board is charging Nissan Motor Co. and a contract worker agency with violating workers’ rights at the company’s assembly plants in Mississippi and Tennessee. Filed Monday, the charges claim Nissan’s uniform policy illegally stifles workers’ right to wear pro-union or anti-union clothing.

in August, the National Labor Relations Board (NLRB) ruled that companies using temporary workers are considered “joint employers” of those workers and share responsibility with staffing agencies for liabilities regarding them.

VANCE, AL—The National Labor Relations Board ruled that Mercedes-Benz U.S. International must rescind a rule in its employee handbook prohibiting workers from talking about a union in work areas while not on work time.

WASHINGTON—The National Labor Relations Board will decide whether employers must permit employees to use workplace e-mail in their collective action to improve wages, hours and working conditions. The decision could hand unions a major weapon in their efforts to unionize.