I'll admit, this is a good one.

Isn't a major concern even among tankies that this revolution of theirs must be "the final one"?

One of the earliest known Dystopia novels, We, written by Yevgeny Zamyatin in 1921 and predating Brave New World (1932), Anthem (1938) and Nineteen Eighty Four (1949), which it directly inspired. It's also notable for being the first work banned by Goskomizdat, not published in the Soviet Union until 1988, and some part of the description of the One State read as frighteningly similar to Stalinism -- eight years before it began to take shape. (The Soviets especially didn't like the book's implication that theirs was not the final, destined-for-success revolution.)