may apply its distinctive techniques to a certain subject matter sheds
little or no light on the question whether one of the other departments
may deal with the same subject matter according to its distinctive
techniques. Indeed, were it otherwise, the action of the Court in
disallowing President Truman's seizure order would have been of very
questionable validity, inasmuch as the President himself conceded that
Congress could do so.

The conception of the Separation of Powers doctrine advanced in
Youngstown appears to have been an ad hoc discovery for the purpose of
disposing of that particular case.

To sum up the argument to this point: War, the Roosevelt-Truman
programs, and the doctrines of Constitutional Law on which they rest,
and the conception of governmental function which they incorporate, have
all tremendously strengthened forces which even earlier were making,
slowly, to be sure, but with "the inevitability of gradualness," for the
concentration of governmental power in the United States, first in the
hands of the National Government; and, secondly, in the hands of the
national Executive. In the Constitutional Law which the validation of
the Roosevelt program has brought into full being, the two main
structural elements of government in the United States in the past, the
principle of Dual Federalism and the doctrine of the Separation of
Powers, have undergone a radical and enfeebling transformation which war
has, naturally, carried still further.


III

A Government of Laws and Not of Men