Thomas Faulkner, who just lost the 1927 Presidential elections, accused Charles D. B. King, who was elected after a scandalously rigged election (King received !), of allowing slavery to exist in Liberia, along with several high-ranking officials.

A Committee of the League of Nations was established to examine the allegations and put the results of its work in the Christy Report.

In this report, it was noted that, although slavery, as defined by the exercise of property right in another human being, didn't exist in Liberia, officials were involved in forced recruitment for Firestone plantation, Fernando Poo and the then French Gabon. Additionally, an old man said to Fred P. M. van der Kraaij the Liberian Frontier Force used to go to villages and forcibly recruit inhabitants to work for Firestone. Official 1930s sources estimated around 85% of workers for the Firestone Plantations weren't doing do voluntarily.

Workers were sent abroad until, in August 1961, as reprisals for Liberian anti-colonialist positions, Portugal filed a complaint with the International Labour Organization, leading to the enactment of a law regulating the recruitment of labour in Liberia on 1962, although the ILO Commission published its findings on 1963.

Source: "The 1930 Forced Labour Scandal", Dr. Fred P. M. van der Kraaij