The Making Ethical Decisions box titled, $"$To Cross or Not to Cross?" discusses:

the violence that occurs at picket lines, and the welfare of those who are physically hurt as a result of these occurrences.

the ethics of participating as a strikebreaker in your community.

how givebacks are very unethical on the part of management in large operations and an indication that management has "crossed the line."

the ethics of participating in the blue flu.