This document provides an overview of the structure of the US federal bureaucracy. It discusses the three main types of federal administrative entities: cabinet-level departments, independent agencies, and regulatory boards and commissions. It also outlines some of the key characteristics of bureaucracies, including their hierarchical structure, specialization of tasks, explicit rules and procedures, and emphasis on objective merit-based hiring and processes. Additionally, it examines the roles of administrators, rule makers, and judges within bureaucracies and their relationship with Congress and interest groups.