Who is John Galt?
Answer: A megalomaniacal psychopath whose ambition is to destroy civilization as constituted. He is also the fictional hero of Ayn Rand's gigantic word brick, Atlas Shrugged. His ambitions are aided by his considerable magical powers which allow him to conjure amazing inventions out thin air. Of course the author attributes the inventions not to magic but to super-intelligence, an intelligence entirely belied by his idiotic philosophical monologues. I like to think of him as a sort of motor-mouth Lord Voldemort.
His psychopathic character is perhaps unsurprising when you consider that Rand based some of her heroes on a notorious child murderer who delivered his victim's body parts to the parents. Of course she claims she didn't admire his deeds, just his attitude.
It is more than a bit bothersome to me that this novel and author are bible to many of the Republican big shots, including Rand Paul, who had all his staffers read AS. The novel is also immensely popular, having sold many millions of copies, and young libertarians are likely to be be fans.
I've written extensively about it here:
And so it goes.