What does a labor union represent?

A labor union represents a group of employees collectively negotiating work conditions. Unions are formed to enable workers to come together and voice their collective interests in matters such as wages, benefits, hours, and other working conditions. This collective bargaining power can lead to better agreements with employers compared to individuals negotiating on their own. Unions also work to ensure that workers' rights are protected, often advocating for fair treatment and safe working environments.

The other options mentioned do not accurately describe the primary role of a labor union. Government entities focus on regulation and enforcement of laws related to employee safety, contractors manage specific projects and hire workers, and an organization providing temporary housing does not relate to labor organization or employee representation. Thus, the representation of collective employee interests in negotiations makes the first option the correct answer.