In the post-2001 context of economic and political conflict, this book presents a timely and detailed examination of the role of the criminal law in the protection of the existing order from political dissent and destabilization. It reviews offences such as rebellion, treason, mutiny, espionage, sedition, terrorism, riot and unlawful assembly in the UK, US, Canada and Australia from a comparative perspective and investigates leading cases in their historical and political contexts. Also examining the impact on human rights and civil liberties, this book covers a neglected area of English-derived law and will encourage debate about crimes against states and governments.