When my wife was in management at Montgomery Wards in the late 70s early 80s, she was TOLD the store had to have 100% participation in donating to the UW. You had to agree to have it deducted from your pay automatically....or else. Typical UW strong arming.
She said fine, and authorized 10 cents a week. And they did indeed deduct 10 cents a week from then on until she left the company.