A319 FLT CREW MAKES EMER STOP DUE TO PERSONNEL UNDER ACFT.

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AFTER PUSHBACK; THE GND CREW DISCONNECTED THE TOW BAR; REMOVED THE PIN AND GAVE US A WAVE-OFF. AS I BEGAN TO TAXI; I SAW ONE OF THE RAMP CREW; SOME DISTANCE AHEAD OF THE ACFT; TURN AROUND AND START YELLING TOWARDS THE ACFT. THE FO SUSPECTED SOMEONE MIGHT BE IN FRONT OF OR UNDER US BECAUSE OF THE GUY YELLING; SO I STOPPED THE ACFT. SURE ENOUGH; A RAMP CREW THEN WALKED OUT DIRECTLY IN FRONT OF THE NOSE. I HAVE ABSOLUTELY NO IDEA WHY HE WAS UNDER THERE; OR WHY THEY GAVE ME A WAVE-OFF WHEN THERE WERE STILL PEOPLE NEAR THE ACFT. IF THE FO HADN'T MADE THE OBSERVATION HE DID; I WOULD HAVE DEFINITELY TAXIED OVER THE RAMPER. I DON'T KNOW WHY THE RAMPER WE COULD SEE DIDN'T GIVE ME A STOP SIGNAL. GND CREW MUST UNDERSTAND THE HAZARDS OF OPERATING AROUND ACFT AND STRICTLY ADHERE TO SOP'S. THIS CAN ONLY BE ACCOMPLISHED WITH GOOD TRAINING AND BETTER SUPERVISION. AS AN OPERATING TECHNIQUE OF MY OWN; I ALWAYS TURN ON THE TAXI LIGHT WHEN I'M ABOUT TO START MOVING. THIS SHOULD SERVE AS AN ADDITIONAL SIGN THAT I AM ABOUT TO MOVE. I DID SO IN THIS CASE; BUT I DON'T KNOW HOW EFFECTIVE IT WAS.