Self help comes in many forms. When legally allowed to take action, it could be a wild cat strike or the threat of one. Say we were to have last names that end in a-m stay home on a given day, or have a card draw 1-7 and if your group is 1 Monday, 2 Tuesday etc. or just specific destinations for x number of days. We would keep working but make it impossible to plan. It's been done before.