How can a 17 year old get legal action taken against parents for cruelty and abuse?

The teenager would have to consult the state about the abuse that he/she was receiving, and the state would press charges. The teenager would be removed from his home, if he was still living there, and placed somewhere that the state approved as 'safe'. Please note that being grounded or yelled at is not abuse. That is actually good parenting, and you will most probably understand that someday. If this is not what you refer to, then feel free to contact the state.