A file of correspondence and memoranda concerning the investigation of the Corby case, in which the defection to Canada of Soviet embassy worker Igor Gouzenko revealed the existence of a Soviet espionage network in Canada. The documents in this file discuss an approach by the Swedish government asking for information on the Corby case; copies of the reports on the case by the Canadian Royal Commission; a transcription of a speech about the case given by Canadian Prime Minister Mackenzie King to parliament; a debate over the legality of an arrest of a member of parliament; a report of an interview with another suspected agent in Britain; a press cutting reporting the conviction of a British nuclear scientist for espionage; a debate over whether to give a government job to another scientist under suspicion; and arrangements for the sharing of information with the Americans.