Governments have often claimed that modern international terrorism cannot be handled adequately within the ordinary criminal justice system. Consequently criminal law had to be adapted to fight terrorism more effectively, which includes the criminalization of certain abstract danger, preparatory activities such as terrorist training, membership in a terrorist organization etc. National legislation has evolved against the background of international and European instruments. This collective book presents and discusses the latest counter-terrorism policies at the EU level, and particularly instruments for approximation in the field, namely the Framework Decision 2002/475/JHA on combating terrorism and the Framework Decision 2008/919/JHA amending the previous one.