Teamsters union threatens nationwide Costco strike if "industry-leading agreement" isn't reached by Jan. 31 deadline.

The unionized Costco workers are on a contract that expires Jan. 31, according to their Teamsters representatives.

Workers at America's largest wholesale retailer may soon go on strike as the corporation has seen profits skyrocket in recent years, union officials said. Costco workers nationwide voted by an overwhelming 85-percent margin to authorize a strike,