This work investigates the complex intersection of Japanese immigration policy, the lived experiences of foreign laborers, and the regulatory mechanisms employed by law enforcement agencies. Wolfgang Herbert, an expert in Japanese social studies, utilizes ethnographic research and historical analysis to examine how the state manages the influx of migrant workers. The book argues that the Japanese legal framework often prioritizes social control and administrative order over the integration of foreign residents, creating a precarious environment for those outside the traditional labor structure.

Scholars in the field of Japanese sociology frequently cite this text as a foundational resource for understanding the systemic challenges faced by migrant populations in Japan. Readers often note the academic rigor and the detailed, objective presentation of legal and social data throughout the chapters.