The misperception that unions are only for blue-collar workers is one of the causes of the decline of quality of life for the average American worker.

America made a massive shift from labor-backed economy to service-sector-backed economy, and in doing so, the percentage of workers in unions dropped drastically. Unions aren't for only labor; they're for any situation where there's an asymmetry in negotiating power between the company owners and the employees (which is, basically, every company).