McDonald’s and its franchisees illegally retaliated against employees for participating in union-related activities, the National Labor Relations Board’s top lawyer alleged Friday in a case with sweeping industry implications. NLRB general counsel Richard Griffin announced Friday he will issue 13 complaints involving 78 charges against franchises and McDonald’s USA, LLC. Though many of these alleged labor violations were committed by independent franchise owners, Griffin ruled earlier this year that McDonald’s can be held liable for those actions as a so-called joint employer, leaving the corporatrion — and potentially other franchisors — exposed to such claims. McDonald’s said the decision will...