Call the parole office for the county in which the parolee lives. Identify yourself (or not), identify the parolee, and ask to speak to that person's parole officer. You may not reach him/her, but...
It would be a wise idea to cooperate - if you don't, you could possibly be charged wtih Obstruction of Justice - Hindering a Police Investigation - Harboring a Fugitive - Etc..
If, however, you have...
Parole violations that are not criminal violations also are not criminally prosecutable. Rules violations or "Technical Rules violations" are just that, violations of rules established by the parole...