migratory labour, noun phrase
1. Usually in the phrase migratory labour system: migrant labour sense 1.
1952 B. Davidson Report on Sn Afr. 94Migratory labour..has been..condemned by official investigators.
1989 Weekly Mail 3 Feb. 12The migratory labour system has not only given rise to violence, it has resulted in the suppression of the fundamental human rights that are the hallmarks of successful business enterprises and societies world-wide.
2. migrant labour sense 2.
1985 S. Afr. Panorama June 35It was on the Kimberley diamond mines that the system of employing migratory labour from the Black homelands was introduced for the first time, later to spread to all of the country’s gold and other mines.