The federal bureaucracy has grown dramatically since its initial small size of 3,000 employees in 1800. It saw significant expansion in the late 1800s with the establishment of departments like Agriculture and Commerce, and its largest growth spurt occurred in the 1930s during the Great Depression with agencies such as the SEC, SSA, FDIC, and TVA. There are various types of federal agencies including cabinet departments, independent agencies, regulatory agencies, and government corporations. While most federal employees are hired based on merit, agencies still seek to maintain influence through expertise, cultivating clientele groups, and maintaining connections to elected officials. Agencies are accountable to the presidency, Congress, courts, and through internal mechanisms.