The article discusses the legal aspects of agreements between contractors and contract workers' unions. It explains that for an agreement to be considered a collective agreement, the parties involved must have the capacity to negotiate such agreements. This means that contractors must have a direct involvement in employment contracts or a similar status. If the agreement meets the requirements set by the Labor Union And Labor Relations Adjustment Act, it can be considered a collective agreement. The article suggests that contractors can be seen as joint employers in the context of contract and subcontract relationships.