Professional-managerial class. Originally it was a term in Marxist and paleoconservative analysis to refer to an emerging class of workers who do not own the means of production (and hence are not "capital" per se) but have ended up de facto doing all the management of capital because of the distributed power and ownership structures endemic to modern society (and so are not quite the proletariat either). Colloquially (as the parent is using it) it is used derisively to refer to busybody white-collar workers who produce nothing of value and seem to exist only to further bureaucratic obstruction.

"professional managerial class" which is basically interchangeable with "petite bourgeois" in a lot of contexts.

Professional managerial class. Generally used derisively to refer to people with high paid jobs who serve the interests of the wealthy.

When congress took out all those PPA loans and then forgave them, they used the new money to pay the PMC to further their interests.

Looks like the NIH is a similar story of corruption.