Turkish protesters gather behind a tunnel as riot police fire tear gas to disperse a May Day rally near Taksim Square in Istanbul on May 1, 2014. Turkish police used water canon and tear gas to disperse thousands of protesters who tried to defy a Labour Day ban on demonstrations on Istanbul's Taksim Square, the scene of protests that have dogged the government for months. AFP PHOTO/GURCAN OZTURK        (Photo credit should read GURCAN OZTURK/AFP/Getty Images)