The United States has launched a crackdown on so-called Chinese police stations operating on its soil using a legal mechanism that doesn't exist in Canada, at least not yet — a registry of foreign agents. U.S. authorities this week announced they had shut down what they referred to as a Chinese police station in lower Manhattan. The criminal charges they laid were against two American citizens who allegedly failed to register their work on behalf of the People's Republic of China. In vivid detail, authorities alleged the American suspects frantically tried to hide those foreign contacts. They said one spent...