Jerusalem crickets are potentially huge insects that feed on vegetables and root crops, but primarily are predatory on other insects. Females are even known to kill and eat a male following copulation. They have huge, strong jaws which they use for digging, allowing them to burrow under rocks or bury themselves in holes in the soil. These are nocturnal insects, they are wingless, and with their large size and active movement they cause fear among people who stumble upon them. They are capable of biting but otherwise are harmless.
There is very little reason to control these insects, and their presence is more beneficial than harmful due to their feeding on other insects. Good building construction will help to keep them out of structures.