Between 1926 and 1959, the Crown united Bioko and Río Muni as the "colony of Spanish Guinea". The economy was based on the exploitation of the commodity crops of cacao and coffee, produced at large plantations, in addition to logging concessions. Owners of these companies hired mostly immigrant contract labour from Liberia, Nigeria, and Cameroon. Spain mounted military campaigns in the 1920s to subdue the indigenous Fang people, as Liberia was trying to reduce recruiting of its workers. The Crown established garrisons of the Colonial Guard throughout the enclave by 1926, and the whole colony was considered 'pacified' by 1929.