"Prison Officers Association" . "National Union of Police and Prison Officers" . "POA (trade union)" . . "POA (trade union)" . . . . "Prison Officers Association (Scotland)" . . . . . . "Prison Officer's Association" . . . "Prison Officers' Association" . . . . . . "Prison Officers" . . . "Prison Officers\u2019 Association" . "POA trade union" . . . . . . . . . "POA" . . "The POA: Professional Trades Union for Prison, Correctional and Secure Psychiatric Workers" . .