can your old employee stop you from getting a job if fired for insubordination.. if they lied?

It is unlawful in Noth Carolina to "black list" an employee.  Black listing essentially means that the employer is actively trying to stop you from getting a job.  However, a reference that has negative information is not unlawful in most cases.  These things can be complex so you might want to try to consult with an experienced employment attorney if you have more questions.