Which agency is responsible for regulating and overseeing federal credit unions?

The National Credit Union Administration (NCUA) is the agency responsible for regulating and overseeing federal credit unions. This agency was established to ensure the safety and soundness of federally insured credit unions, protecting members' deposits and promoting consumer protection. The NCUA provides insurance to members’ accounts, similar to what the FDIC does for banks, and also monitors credit union operations to ensure compliance with federal regulations. Given its specific focus on credit unions, the NCUA plays a critical role in the management and regulatory oversight of these financial institutions, ensuring they operate in a safe and sound manner.

The other options mentioned, such as the Federal Reserve, the FDIC, and the Treasury Department, have important roles in the financial system but are focused on other areas, such as regulating banks, providing deposit insurance for bank deposits, and managing monetary policy and financial stability, respectively.