Checks and balances are an important thing. This is probably something that you learned in middle school when it comes to the US government, but it is an equally applicable system in all walks of life. The checks and balances that exist between employers and employees has proven to be an important element of modern life as well.
Part of that balance is the formation of workers’ unions, and all sorts of different fields participate in the collective bargaining power of unionized workers, though they are not as strong as they once were as governments at both the national and regional level works to enact laws that hinder their formation.