Runners are people in all forms of Logan's Run media.
They choose to flee from Last Day. They do not believe they will be renewed in Carousel, so instead they choose to run and seek Sanctuary. Runners are continually hunted by Sandmen, whose job is to kill them using laser guns that emit various projectiles. Should a Runner be killed, his earthly remains will then be handed over to a "cleanup crew", who use chemicals which cause the Runner's body to decompose into nothing immediately. It is believed by the Sandmen that Runners get the worst punishment; never having potential for renewal.
Hal 14 - from The TV Series