HONG KONG—Hong Kong’s national security police arrested a veteran journalist and former contributing writer with the now-shuttered liberal media outlet Stand News, on Monday for alleged sedition, police and local media said. A crackdown on the media based on a sedition law that dates from the British colonial-era, as all as a Beijing-imposed national security law has seen several major media outlets raided by police and closed down, including the Apple Daily newspaper and the Stand News online news portal. Local police said in a statement that the national security department of the police force had arrested a 54 year-old male for “conspiracy to publish seditious publications” and had detained him for further investigation. Local media indentified the man as Allan Au, a veteran journalist and academic at the Chinese University of Hong Kong who wrote columns for newspapers including Ming Pao and the now closed Apple Daily. Reuters was …