However, in land reclamation projects in Hokkaido and at the labor site of coal mines in Kyushu (the Mitsui Miike coal mine in relation with Miike Shujikan), Takobeya (labor camp) Rodo, a form of labor under which general workers were placed in confinement and exploited to make up for the shortage of workforce, developed.
しかし、北海道では開拓事業や九州の炭鉱労働（三池集治監の三井三池炭鉱）の現場では労働力不足を穴埋めするように一般労働者を監禁して酷使するタコ部屋労働が発展した。