"Repent, Harlequin!" Said the Ticktockman

In the far future, time is considered so precious that it's a criminal offense to waste it. The dreaded Ticktockman (he hates it when people call him that) enforces the law. But then the man known only as The Harlequin came into the picture. One of Ellison's most acclaimed works, this story won both the Hugo and Nebula when it was published. It's part satire, part allegory, part warning, and all Ellison.