Federal complaints have been filed against Colorado’s top three grocery chains, who have signed a pact to share revenue in the event of a strike. The United Food and Commercial Workers International Union alleges that Safeway, King Soopers and Albertsons have refused to turn over details of the pact and are violating antitrust laws by making the deal. The two sides are currently in contract negotiations and the UFCW could strike if a compromise is not reached by the end of the week. There is disagreement over health care benefits and wage increases. UFCW Local 7 represents the more than 17,500 workers involved in negotiations.