This book provides a systematic and comprehensive overview of the increased role of criminal law in managing migration, from a European, domestic and comparative law perspective. The contributors critically engage with the current trends leading to the criminalisation of irregular migrants, asylum seekers and those who engage in 'humanitarian smuggling' and the national and common policies calling for a broader use of criminal law measures. The chapters explore the measures used to protect borders and their impact in terms of effectiveness and their ability to strike a fair balance between security and the protection of human rights. The contributors to the book cover a range of disciplines within law, human rights and criminology resulting in a broad understanding of the issues at play.