The base argument here is that if agencies can arrange deals with management to enrich the agent for millions, but the agent claims they cannot get a few extra

The base argument here is that if agencies can arrange deals with management to enrich the agent for millions, but the agent claims they cannot get a few extra dollars for the agents actual client, then things are broken sounds fair, but also sounds like a lot of similar situations across different industries - which for all intents and purposes can be called "lack of trade union". It's going to be a long road.