But since mass rallies in 2014 for fully free leadership elections failed to win concessions, young campaigners have become increasingly frustrated, with some suggesting they might use violence to force change. Authorities have cordoned off the convention centre with water-filled plastic barricades and police are even patrolling Lion Rock where pro-democracy protests banners have regularly been unfurled. But activists from the League of Social Democrats managed to hang a banner calling for universal suffrage on a nearby hillside yesterday morning. Another, demanding the "end of Com munist Party dictatorship," was hung on a highway from the airport into the city.