By all accounts, this was an unusual tactic in a labor dispute, even for Boston. Thursday night, right in the midst of the dinnertime rush at one of the city's fanciest steakhouses, The Capital Grille on Newbury Street, a local labor leader allegedly walked into the dining room, opened a white shopping bag, and let three white rats loose. A commotion ensued as the varmints scurried about and diners slicing $40 cuts of dry aged sirloin and other succulent entrees scattered. Out the door, police say, ran Louis J. Antonellis, a business agent for the International Brotherhood of Electrical Workers...