A Supermarket Grossly Underpays Its Staff. Can You Make a Difference by Avoiding Shopping There?

You go to a supermarket from where you regularly buy your groceries, and find that the store is being picketed by workers...

You go to a supermarket from where you regularly buy your groceries, and find that the store is being picketed by workers saying that they earn below minimum wage and work 70-odd hours a week. Should you still go in, or avoid the store?