Animal Farm

Generally taught as an anti-Communism book.  Orwell didn't necessarily see it as that simple:

...I did mean it to have a wider application in so much that I meant that that kind of revolution (violent conspiratorial revolution, led by unconsciously power-hungry people) can only lead to a change of masters. I meant the moral to be that revolutions only effect a radical improvement when the masses are alert and know how to chuck out their leaders as soon as the latter have done their job.

I'm not sure it doesn't even apply more broadly (i.e. to non-violent revolution).  I can see definite parallels to Obama's presidency, where he came in on Hope and Change and lots of people supported him as a major turning away from past policy and once he got into office he broadly adopted that past policy that many (most) of his supporters had been railing against.  More, when he did that, rather than immediately decry the behavior, most people just accepted it, and him.