They have no reason to be on a board. These dudes suck, they are perverted in what ever they do, post, game, download, upload, chat, live, etc. They get every one pissed and often get themselves deleted off boards. Crashers crash boards for reasons or most of the time no reasons. They prefer commie boards since commodores are easiest to crash.
Crashers really give sysops bad times ahead.
Sysops are the kings of boards, they control, they modify, they repair. These are the commanders of all of the above. New Users are just non-validated scums. Just validate them and they'll become one of the above. Hopefully you'll place them under watch and see what happens.