HONG KONG—The first person charged under the national security law in Hong Kong will face a trial without jury, the city’s High Court ruled on Thursday, in a landmark decision that marks a departure from the global financial hub’s common law traditions. Police say Tong Ying-kit, carried a sign reading “Liberate Hong Kong, revolution of our times,” and drove his motorbike into officers during a protest on July 1, knocking several down on the narrow street before falling over and getting arrested. It was the first day on which the national security law was in force. The law punishes anything authorities deem as secession, separatism, terrorism, or collusion with foreign forces with up to life in prison. Tong, 24, was among more than 300 demonstrators against the new law who were arrested that day, and was charged with inciting separatism and terrorism. In February,Teresa Cheng, Secretary for Justice,  informed the …