This episode contains an overview of the history of national security law in Canada, starting with the MacDonald Commission and the October Crisis of 1970, the formation of the Canadian Security and Intelligence Service, the Air India bombing, the Arar Inquiry, 9/11, and Bill C-51. We also discuss the roles of CSIS, the Communication Security Establishment, the Royal Canadian Mounted Police, and the Canada Border Services Agency, in administering Canadian national security legislation. Finally, Professor Roach provides an in depth analysis of several controversial elements of the previous Conservative Government of Canada's Bill C-51, and the current Liberal Government of Canada's response under Prime Minister Trudeau. Kent Roach is a Professor of Law and the Prichard-Wilson Chair of Law and Public Policy at the University of Toronto. He is a Member of the Order of Canada and is considered to be one of the foremost experts on national security legislation in Canada.