ATHENS Around 25,000 people marched through Athens over the weekend in closely watched demonstrations to mark the 51st anniversary of the pro-democracy uprising that helped topple military rule in Greece . The protests are held every year to commemorate the 1973 Athens Polytechnic protests that killed 24 people, when the ruling junta sent troops to break up an anti-government uprising. As the commemoration is often marred by far-left violence on the sidelines, more than 5,500 officers were