The United Food and Commercial Workers Union (UFCW) has filed a complaint asking the National Labor Relations Board to investigate whether a top Wal-Mart executive “bribed” employees to work against the union.

The United Food and Commercial Workers Union (UFCW) have filed a complaint with the National Labor Relations Board over the agreement between Albertsons, King Soopers and Safeway to share revenues in the event of a strike by grocery workers in Colorado.