Labor unions in Los Angeles are going head to head with Paramount-based grocery chain El Super, again.

The unions announced a boycott of the chain Thursday, making it the first major grocery boycott by L.A. workers since a supermarket strike in 2003.

One-fifth of El Super’s 35 Southern California stores are unionized, and it and the Union Food and Commercial Workers, or UFCW, have had ongoing disputes over labor issues.

Community organizers and El Super workers had called for a boycott of the company last month over allegations of health code violations by El Super.

El Super issued a statement to the Journal saying it implemented a plan to UFCW last year, following “protracted and deadlocked negotiations,” offering wage increases over the next five years, up to four days of additional paid time off and guaranteed weekends off for tenured employees.