ACR CAPT REFUSES TO ALLOW DRUNK PAX TO BOARD ACFT.

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I OVERHEARD RAMP PERSONNEL TELL FLT ATTENDANT THERE WAS A SPECIAL MESSAGE FOR HER ON PAX MANIFEST. PAPERWORK FOR FLT ARRIVED BEFORE PAX (LOCATED ON REMOTE PARKING RAMP; EVERYTHING COMES VIA BUS TO ACFT). BESIDE NAME OF 1 PAX WAS PRINTED 'PLEASE DO NOT SERVE PAX ANY ALCOHOL; PAX WAS VERY DRUNK ON PREVIOUS FLT.' I IMMEDIATELY CALLED OPS AND DENIED BOARDING TO THIS MAN. TOO LATE; HE WAS ALREADY ON BUS WITH OTHER (8) PAX AND ENRTE TO ACFT. OPS SAID A PAX AGENT WOULD BE SENT OUT (I PRESUMED TO KEEP PAX OFF ACFT AND ESCORT HIM BACK TO TERMINAL). AGENT CAME TO COCKPIT BEFORE PAX WERE BOARDED. SHE (A COMPANY EMPLOYEE) TRIED TO CONVINCE ME TO ALLOW THIS PAX ON BOARD. AT ALL TIMES I GAVE A FIRM NO TO BOARDING THIS DRUNK PAX. OTHER PAX WERE BOARDED. PAX AGENT AGAIN CAME TO COCKPIT AND MORE EMPHATICALLY TRIED TO CHANGE MY DECISION. AGENT LEFT; FLT FLOWN UNEVENTFULLY. AFTER LNDG; 3 PAX THANKED ME FOR NOT ALLOWING MAN ABOARD WHOM THEY DESCRIBED AS LOUD; ABUSIVE; AND AGITATED. IF I HAD NOT HAPPENED TO OVERHEAR RAMP TELLING FLT ATTENDANT ABOUT 'SPECIAL MESSAGE ON MANIFEST' IT IS LIKELY THIS PAX WOULD HAVE BEEN BOARDED. A 'VERY DRUNK' PERSON IS A POTENTIAL THREAT TO ALL ABOARD ACFT. ANY AND ALL PEOPLE WHO ALLOWED THIS INCIDENT TO OCCUR NEED EDUCATION; RE-TRAINING; AND PUNISHMENT. TOO OFTEN PAX AGENTS FORGET RESPONSIBILITIES FOR SAFETY AND FOCUS ONLY ON MAINTAINING SCHEDULE INTEGRITY BY MOVING THE PAX OUT OF THE BOARDING ROOM ONTO THE PLANE; AT ALL COSTS.