Congress passes laws, but it rarely fills in every detail. It hands agencies the job of deciding how clean the air must be, which drugs are safe, how banks must manage risk, and who qualifies for benefits. Over time this delegation built a large and powerful layer of government that touches nearly every part of daily life, from food labels to airline safety.
This guide explains what agencies do, how rules are made and cases decided, who oversees the agencies, how the courts have recently pushed back, and the arguments for and against the administrative state.
Under the Administrative Procedure Act, an agency usually publishes a proposed rule, invites public comment, considers the comments, and issues a final rule with an explanation. Major rules go through review by the Office of Information and Regulatory Affairs, often with a cost-benefit analysis. Agencies also issue guidance documents and policy statements that are not binding law but shape how rules are enforced. A rule can be challenged in court as arbitrary and capricious or beyond the agency's authority.
Agencies hold far more hearings than federal courts. Administrative law judges, most of them at the Social Security Administration, decide disability claims, enforcement actions, and licensing disputes, and immigration judges in the Justice Department decide deportation cases. Agency decisions can usually be appealed within the agency and then to federal court. In SEC v. Jarkesy in 2024, the Supreme Court held that agencies seeking civil penalties for fraud must generally bring the case before a jury in federal court.
For forty years, under Chevron v. NRDC, courts deferred to an agency's reasonable reading of an ambiguous statute. In Loper Bright Enterprises v. Raimondo in 2024, the Supreme Court overruled Chevron, holding that judges must decide for themselves what laws mean. Under the major questions doctrine, applied in West Virginia v. EPA in 2022, agencies need clear authorization from Congress for actions of vast economic or political significance. Some justices have also signaled interest in reviving the nondelegation doctrine, which limits how much power Congress can hand to agencies.
The term, popularized by political scientist Dwight Waldo in 1948, describes government by agencies rather than directly by elected lawmakers. Its roots run from the Interstate Commerce Commission in 1887 through the Progressive Era, the New Deal, and the wave of health, safety, and environmental agencies created around 1970. Today agencies employ most federal civilian workers, and their rules are published daily in the Federal Register and compiled in the Code of Federal Regulations.
Defenders of the administrative state say modern problems, from pandemics to financial crises, require expert agencies that can act faster and with more knowledge than Congress, and that procedures, oversight, and courts keep them accountable. Critics say unelected officials make most federal law, that agencies can be captured by the industries they regulate, and that the system blurs the separation of powers. The debate shaped the deregulation drives of the 1980s and the 2025 effort to cut rules and shrink agencies, as well as opposition to those efforts.
The President appoints agency leaders and, through the Office of Management and Budget, reviews their budgets and major rules. In 2025, executive orders extended White House review to independent regulatory agencies and directed agencies to repeal ten existing rules for each new one. For fiscal 2025 the administration reported 646 deregulatory actions against 5 significant new regulations and claimed about 212 billion dollars in savings, an accounting some regulatory scholars questioned. Congress controls agencies through the laws it writes, its appropriations, oversight hearings, and the Congressional Review Act, which lets it overturn new rules. Inspectors general and advisory committees add internal scrutiny and outside expertise.
Follow a regulation step by step in how federal regulations are made, sort the agencies in independent agencies vs. departments, or explore the controversy in the deep state debate.