Falling Torch by Algis Budrys turned out to be a novel set five hundred years in the future, on an Earth conquered by very human aliens (I mean, lots more human, say, than Mister Spock) which seems to have exactly the same technology and culture as the mid-20th century. So, as science fiction, there isn't much there. However, the author's intent seems to have been a study of the psychology of a person who doesn't fit into society who eventually becomes a great leader. Also, there is probably some influence from the author's experience of having to flee Soviet-occupied Lithuania at a very young age, and being the son of the consul general of the Lithuanian government in exile. So, of some interest in that way.
I have now started the same author's Some Will Not Die (1978 expansion of 1961 novel), which may deal with the some of the same themes. It takes place after a plague wiped out 90% of humanity, and a leader emerged to stabilize the government of New York for some years, but then was apparently killed and become a sort of legend. (This is all revealed very early in the book, so not a spoiler.)