AIDAN LEWIS and MAHMOUD MOURAD TEN years ago protesters surged onto Egypt's streets, emboldened by the success of Tunisia's Arab Spring uprising. Some young activists formed the Revolution Youth Coalition to draw together the uprising's disparate strands and give the protesters occupying Cairo's Tahrir Square a coherent voice. They demanded freedom, dignity, democracy and social justice amid battles with police and state-hired thugs, and on February 11 President Hosni Mubarak resigned. But the coalition fragmented as it faced two much more established forces: the Muslim Brotherhood that swept to power in later elections, and the military that toppled it in…