Why is it important for citizens to understand the investigative and oversight powers of congress?

Studies by congressional committees and support agencies such as the Congressional Budget Office, the General Accounting Office, and the Office of Technology Assessment — all arms of Congress. The oversight power of Congress has helped to force officials out of office, change policies, and provide new statutory controls over the executive.

Explanation:

It's important for citizens to understand congress because it is the citizen's job to ensure the government doesn't have too much power. If no one knew what too much power is, according to the constitution, we wouldn't know if the government was taking too much power.