WAY DOWN SOUTH IN WENCESLAS SQUARE IT WAS ALL RATHER EMBARRASSING . JUST AS RADIO PRAGUE WAS GLEEFULLY REPORTING THE BATTLE IN BIRMINGHAM, RACE RIOTS EXPLODED IN THE HEART OF THE COMMUNIST CAPITAL . IT BEGAN AT MIDDAY NEAR THE AMBASSADOR HOTEL JUST OFF ANCIENT WENCESLAS SQUARE . TWO FOREIGN STUDENTS ONE FROM AFRICA AND ANOTHER FROM THE MIDDLE EAST WERE OUT FOR A STROLL WHEN THEY WERE ATTACKED BY A GANG OF 300 CZECHS WHO PUMMELED THEM WITH FISTS AND BUNCHES OF KEYS WHILE POLICE STOOD IDLY BY . THAT EVENING ANOTHER GROUP OF YOUNG CZECHS BEGAN SWINGING AT AN AFRICAN WALKING WITH HIS CZECH WIFE, THEN PICKED A FIGHT WITH TWO MORE AFRICANS WHO HAD BEEN ARGUING WITH SOME CUBANS . THIS TIME POLICE BROKE UP THE BRAWLS, BUT NOT BEFORE A FOURTH INCIDENT OCCURRED . AN AFRICAN DIPLOMAT HAD PARKED HIS CAR TO INVESTIGATE THE TROUBLE ; HE RETURNED TO DISCOVER THAT ALL FOUR OF HIS TIRES WERE SLASHED . FIVE DAYS LATER, WHEN RADIO PRAGUE FINALLY GOT AROUND TO REPORTING THE ANTIAFRICAN OUTBURSTS, THE REGIME GLOSSED OVER THE INCIDENT AS THE WORK OF DRUNKEN HOOLIGANS . IT WAS MORE SERIOUS THAN THAT . FOR MONTHS, CZECHS HAVE COMPLAINED THAT SUBSIDIES TO UNDERDEVELOPED COUNTRIES, INCLUDING DIRECT OUTLAYS TO SCHOLARSHIP STUDENTS, ARE RESPONSIBLE FOR CZECHOSLOVAKIA'S WORSENING LIVING STANDARD . AND THE BLACK STUDENTS IN PRAGUE SOMETIMES SEEM TO WALK AWAY WITH THE PRETTIEST GIRLS . THE ARRIVAL OF AFRICANS HAS CREATED RACE PROBLEMS IN SEVERAL PARTS OF THE COMMUNIST WORLD . THERE WAS TROUBLE IN PRAGUE LAST YEAR . AT MOSCOW'S PATRICE LUMUMBA UNIVERSITY, 500 AFRICAN STUDENTS ARE CAREFULLY SEGREGATED FROM RUSSIANS ; THREE MONTHS AGO IN SOFIA, 600 CLUB-WIELDING BULGARIAN COPS CRACKED THE SKULLS OF AFRICAN STUDENTS WHO WERE DEMONSTRATING FOR NOTHING MORE THAN THEIR OWN CAMPUS ORGANIZATION .