Violating your parole can get you arrested and jailed.
Then when you go to court the violation of parole could even send you back to prison for a few years or longer depending on your criminal history.
If you were in prison and go out on parole then you did something to violate the parole you're gonna be arrested and serve at least some jail time.
The parole boards decision is not an easy one and when they decide to let someone out on parole they are believing that the person will do good out in society.
If you violate parole even once and go to prison for something and then come up for parole again then your parole will likely be denied.
When on parole you have to report to your parole officer and your parole officer can show up at your house or work at any time to check on you.
If you don't report to the parole officer on time or at all then the police will be coming after you and arrest you for parole violation.