They are undefined because the structure and system of their power isn't clearly laid out in the Constitution. The Constitution clearly defines the Presidency, the Congress, and the Judicial system for the federal government. However, those that support the three branches aren't spelled out; this has allowed the three branches to delegate their authority to these groups (whether for good or ill) in order to efficiently improve the functions of government.
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Federal Bureaucracy
There is no Executive branch of the federal courts.The United States has a tripartite government that comprises three branches, each with its own constitutional powers and checks against those powers. The Executive branch and the federal courts (Judicial branch) are two different parts of government.Executive branch: President, Vice-President, Cabinet, etc.Legislative branch: US Senate, US House of Representatives (together, they're called "Congress")Judicial branch: Supreme Court, lower federal courts (SCOTUS* is the head of the federal court system)*SCOTUS is an acronym for Supreme Court of the United States
The legislative branch is referred to as Congress in the United States. In other countries, the legislative branch may be called other things, such as Parliament, the Diet, National Assembly, and others.
The federal system of government established by the Constitution of the United States allows ordinary citizens many was to access government. The great increase in federal programs, beginning with the New Deal, called for an increase in the size of the bureaucracy. The bureaucracy is the organization of government administrators created to carry out legislation. The great majority of bureaucrats who are part of the civil service system are, for all practical purposes, beyond reach by elected officials. Each bureaucrat serves the department in which he/she works and can be fired only if certain steps are taken. So, in effect, the bureaucracy is controlled by the government that created it, and no one person, executive, or elected official.
Bureaucracy can often guide and lead other parts of government. Since they help determine policy, they are indeed part of both the judicial and the legislative system.