The person of interest nabbed in the killing of UnitedHealthcare CEO Brian Thompson is an anti-capitalist Ivy League grad who liked online quotes from “Unabomber’’ Ted Kaczynski — and apparently hated the medical community because of how it treated his sick relative, law-enforcement sources told The Post on Monday.

Tech whiz Luigi Mangione, 26, of Towson, Md., has not been charged but was taken into custody Monday morning at a McDonald’s in Altoona, Pa., after an intense manhunt following the coldblooded execution of Thompson outside a Manhattan hotel last week, sources said.

The former prep-school valedictorian was caught with a gun, silencer, four fake IDs with names used during the killer’s stint in New York City — and a manifesto, sources said.

The manifesto railed against the US healthcare industry, including over its enormous profits and alleged shady motives, sources said.