The United States already named a fourth branch, and named it as unowned.
The President's Committee on Administrative Management — Louis Brownlow, Luther Gulick, Charles E. Merriam — reported in January 1937. Roosevelt sent a summary to the country on 12 January. Beginning with the Interstate Commerce Commission in 1887, they wrote, Congress had set up more than a dozen independent regulatory commissions: "miniature independent governments" for railroads, banking, radio. "They constitute a headless 'fourth branch' of the Government, a haphazard deposit of irresponsible agencies and uncoordinated powers." Congress had "found no effective way of supervising them, they cannot be controlled by the President, and they are answerable to the courts only in respect to the legality of their activities."
That last clause is the essay's own split, already on file in 1937: courts check legality; nobody owns the rest. Brownlow's repair was not a new auditor. It was ownership. Fold the administrative work into ordinary departments under the President; keep only the judicial slice independent. The famous line was "The President needs help." The Reorganization Act of 1939 created the Executive Office of the President. The independent commissions were not folded in.
James M. Landis is the competing model, and it is the opposite repair.
Landis had been on the FTC and the SEC. The Administrative Process (Yale, 1938), the Storrs Lectures, is the defense of the commissions Brownlow wanted to absorb. "In terms of political theory, the administrative process springs from the inadequacy of a simply tripartite form of government to deal with modern problems." Efficiency, he thought, "is best served by the creation of more rather than less agencies." The process was "our generation's answer to the inadequacy of the judicial and legislative processes" — and, he added, an answer "by some other method than merely increasing executive power."
Three builds. Brownlow: put the machine under the President. Landis 1938: mint more independent expert commissions. This essay: a body that publishes findings and forces a public answer, and does not write the rules.
They disagree on what you would see. Brownlow predicts coherence once removal and management run through the White House. Landis predicts better railroad and securities outcomes from tenure and specialization. The essay predicts a recorded override on a mechanism that still failed. Those are different artifacts. Landis's own 1960 Report on Regulatory Agencies to the President-Elect is the 1938 model scored against itself: ICC opinions "in the poorest category," FTC with 309 cease-and-desist matters pending as of 30 June 1959 (118 more than a year, 30 more than three), the Federal Power Commission thirteen years from clearing 2,313 producer rate cases and not current until 2043 even if the staff were tripled. His later repair drifted toward presidential coordination. Still not a response duty on whether the mechanism delivered.
He already says regulatory agencies have been captured and perform fragments, and that constitutional courts test rules against higher rules, not whether a valid law works. That is not what is still open.
What is still open is the title. Brownlow already called the independent commissions a fourth branch and already said the courts only reach legality. If "fourth branch" means an unowned administrative machine that writes and enforces rules, America built it and then argued for a century about who should own it. If it means a duty to ask whether the mechanism produced the outcome it was passed to produce, and to force an answer without substituting a new rule, that is a different organ. The essay's live claim is the second. The first is occupied.