...Notwithstanding the provisions of this paragraph, it is
understood that (1) there is no contractual prohibition on the ability of employees
to honor lawful picket lines of the Company's employees on or in front of the
premises; and (2) the employees covered by this Agreement are not prohibited
from engaging in a concerted refusal to perform Struck Work. Struck Work for purposes
of this contract is defined to be when the Company, in response to a labor
dispute at a company where the employees are engaged in a lawful strike, is performing
work for that company pursuant to an agreement or arrangement with the
company and the Company has not previously performed such work....