Final answer:
Congress controls the bureaucracy by controlling funding, approving appointments, and holding hearings. However, effectively controlling such a large bureaucracy can be challenging.
Step-by-step explanation:
Congress exercises oversight over the federal bureaucracy through its power to control funding and approve presidential appointments. Bureaucratic agencies submit annual summaries of their activities and budgets, and committees hold hearings to question the leaders of the bureaucracies. Congress also controls the bureaucracy by appointing heads of departments and agencies. While oversight is important, it can be challenging to effectively control such a large and complex bureaucracy.