Drawing on extensive foreign material and making use of the social science concepts of information, power and law, this book develops a framework for the comparative analysis of MI5 and police special branches.

What do we know and how do we know it?; the state and security intelligence - concepts and models; defining the security intelligence mandate; penetration I - gathering information; penetration II - producing intelligence; autonomy I - organization and control of security intelligence agencies; autonomy II - principles and institutions of oversight; autonomy III - overseeing the executive; the future of security intelligence. Appendix: Defence Press and Broadcasting Committee D-Notice No. 6.