One time, back in the 80s, American Express had some kind of disagreement with the union that my step-father belonged to and the members of his union went out and every time they'd see the American Express credit card applications, they'd take them all and send them back in blank.

They had been told that each application cost a dollar to have mailed and processed.

I was a child so I never cared enough to ask about the details of the dispute and I don't know how long they did this, only that they did.