What limits are imposed on administrative agencies by each of the following:
(a) the courts;
(b) Congress; and
(c) the executive branch?

The courts exercise a check on administrative agencies by means of judicial review. Courts may either compel agency action unlawfully withheld or set aside impermissible agency actions. Congress exercises control of administrative agencies through its budgetary power; by amending the agency's enabling statute or even by eliminating the agency; by confirming high-level appointments to administrative agencies; by enacting legislation, such as the APA, to establish guidelines; and by reversing or changing agency rules. The executive branch appoints and can remove high-level executives of agencies housed within the executive branch; has a central role in the budgeting process of an agency; and can impound moneys and reorganize or abolish executive agencies.