Suppose hospital nurses bargain with a private hospital over staffing ratios while their union also supports a state bill establishing minimum staffing standards. The bargaining agreement would govern the represented workplace; the statute would govern covered institutions under public law. The union may use workplace experience as evidence during legislative hearings and mobilize members who see a direct connection between policy and daily conditions. Public-sector unions add another complication because government acts both as employer in bargaining and as policymaker accountable to voters.

Collective bargaining and lobbying are not synonyms. Bargaining seeks an employment agreement from an employer; lobbying seeks action from government. A union can do both, and its preferred public policy does not automatically bind every member's vote. Nor does organization guarantee equal influence with business: resources, law, membership density, public opinion, and access differ across industries and states. Analyze the activity and target rather than assuming that every union action is electoral.

Unions can reduce collective-action costs because the workplace supplies an existing network, recurring contact, and shared concerns. They still face free riding, internal disagreement, legal limits, and declining or uneven membership. A member may support the union's wage negotiations while rejecting its candidate endorsement. The same nurses, teachers, or machinists can therefore appear in different political settings: negotiations with an employer are collective bargaining, requests to a legislature are lobbying, and reminders that bring supportive members to the polls are mobilization. The represented employment relationship makes the organization a labor union; the immediate target identifies the activity.

Video lesson: Interest Groups: Crash Course Government and Politics #42