Music Recommendations for Writing A Cold-war, Conspiracy Theory Thriller Fiction

Songs or pieces, (mostly ambient/dark ambient) that convey a sensation of mystery, dread, like if you were investigating an old news report or forbbiden/secret archives, and felt as if you were on a watchlist for doing so/are actively being hunted by a mysterious group of people.

Recs that flirt with/are psychedelic music are also welcome.