The End of Eternity by Isaac Asimov

The story of temporal engineers who meta-regulate the history of humanity through the centuries, eliminating risk, adventure, and space travel in the process. One man rebels in order to save the existence of someone he loves, and in the end the time bureaucracy is destroyed for the sake of individuality and human achievement. The theme is the opposite of the Foundation stories, where the central planners and manipulators of humanity always dominate.