"A report on the Intelligence Branch of the Chief of Police from May 1920 to July 1921". Includes observations about: the difficulties of obtaining and disseminating information about underground organisations in Ireland including the IRA, Sinn Fein and the Irish Republican Brotherhood; the differences between counter-espionage activities during wartime and the circumstances in Ireland; and difficulties for the police. Includes instances of the successful use of intelligence information in raids and arrests and details about the organisation and activities of the IRA and Michael Collins. Appendices include facsimile examples of captured documents.