Make a list of all the cons of having a union. For example, some of the cons might be corruption, lack of organization, possibility of missing out on jobs and job migration.
Research each con that you come up with thoroughly so that you become well acquainted with each issue. Write down the weaknesses and strengths of each con. For example, if one of the drawbacks you researched was the possibility of job migration, figure out how likely and how often that happens when it comes to unions.
Make a list of arguments that someone could come up with to refute your argument. Respond with potential counter arguments and rank your counterarguments according to strength.
Divide debaters into two teams. Draft a statement that addresses the cons of unions, such as, "Unions are often ineffective due to their inability to protect jobs during labor strikes." Give each team a specific amount of time to draft their arguments based on their research and prepare potential counterarguments.
Allow each person to present their original arguments and counterarguments one at a time, taking turns between teams. When finished, the designated cross-examiner rebutallist will summarize all closing arguments in a final speech.