Gaslighting or gas-lighting is a form of psychological abuse in which a victim is manipulated into doubting their own memory, perception, and sanity. -Wikipedia
But gaslighting "a victim" implies a single victim and a single perpetrator, and carries a connotation of intimacy. Is there a term or phrase that describes more or less the same general methods, (sans matrimony), but systematically applied to a body of people, and as perpetrated by some covertly adversarial group?
Propaganda would not be the precise term, (though it might encompass such practices), since not all propaganda requires lying, nor requires the propagandist directly denigrating their own audience. Terms like whitewash, blackball, and smear campaign do imply lying, but the lie or lies more often tend to be about an object or third party.
If no English terms or phrases come to mind, loan-words or foreign phrases would also be useful.
Since this question was first posted, gaslighting has been used in a political sense, for example in this title:
But it seems uncertain whether that's more of a nonce usage which mainly serves as a form of branding just short of a trademark, by which to distinguish that book's marketing from several similar current talking-point books. Answers forwarding this usage as a likely future standard term should provide several actual found usages, (that are not attempts at definitions), as evidence.
A somewhat more ambiguous usage here: