In the following article, we analyze the constitution of various legal categories and the existing articulation that was given to them in the interwar period. In the immediate period after the First World War, the need to organize coexistence between the powers was established. One of the issues inherited from the 19th century and that required a resolution was Slavery. The international organizations resulting from the First World War had different responsibilities, and Slavery was incorporated as central. However, the issue seemed more complicated and it was necessary to deal with the issue of freedom along with the labor issue. Slavery was treated in parallel with forced labor but missing the relationship with poverty. Later, the claims of the colonial countries showed that it was necessary to incorporate a new dimension: native or indigenous work. What seemed simple in principle was presenting an enormous complexity that demanded the entire interwar period to think about alternatives and options that they were imperfect and unsatisfactory for all parties. Finally, we consider how the peripheral countries, specifically Latin America, reacted to these debates on Slavery, forced labor, and indigenous labor.