It gets pretty bad when a 1963 applied sociology study focusing on labour migrancy mentions that the dancing skills and fashion sense of the Brazzaville migrant workers causes tensions and fights in Gabon.
Also, the study suggests that clear contracts with clear and well-understood terms reduce turn-out among migrant workers. No shit. Did the colonists really need a sociologist to tell them that ? (actually not only they did, but they still do).
Here’s the paper (in French).