What is often called “delegation of lawmaking power” is often delegation of the authority to give to any decision the force of law, so that, like an act of the legislature, it must be unquestioningly accepted by the courts.
This brings us to what in modern times has become the crucial issue, namely the legal limits of administrative discretion. Here is ‘the little gap at which in time every man’s liberty may go out’ (Hans Huber)”.
Hayek, F.A., “Constitution of Liberty”, 1960