Administrative agencies exist at every level of government to make, interpret, and enforce regulations on issues like the environment, healthcare, transportation, and more. Congress establishes agencies through enabling acts that set up their basic purpose and authority. Agencies then promulgate rules and regulations through a process that includes issuing notices of proposed rulemaking, accepting public comments, and finalizing or modifying the rules. They also enforce regulations through inspections, prosecutions, penalties and fines. The document provides examples of federal agencies and discusses laws like the Administrative Procedures Act and Freedom of Information Act that govern agencies' operations.