Deportation remains a critical issue within labour migration from East Java to Malaysia. The research presented in this book focuses on the most predominant factors determining why workers from East Java migrate illegally to Malaysia. It finds out that the difference between wages before migration and expected wages in Malaysia, the low educational level (below junior secondary school), being married, and being between 15 and 30 years old increases the probability the workers from East Java migrate illegally to Malaysia. Based on the findings, the recommendations which are proposed to local government are to communicate actively with the migrant candidates to explain legal migration, to implement strict control against the presence of illegal agents, and encourage opening more branches of PPTKIS (Private Agency for Placement of Indonesian Migrant Workers Abroad) in the remote areas in East Java.