Negligent Hiring
One example might involve racial discrimination and harassment. If during a job interview, the Human Resources professional spoke with an applicant about their thoughts and feelings towards members of another race and the applicant indicated their intent to cause problems or harassment, and the company hired them anyway, which then resulted in a harassment situation, this would indicate a case of negligent hiring. In general proving negligence in hiring situations involves showing intent and/or repeated patterns of hiring by an employer.
Please consult an expert in employment law for all legal issues surrounding hiring.