Workers from both Sierra Leone and especially Liberia were transported as workers to Bioko Island. As English speakers with some Anglo culture, they became a dominant force in the evolution of local society and economy and took on leadership roles. They tended to marry among themselves, as they identified as separate from the local, less educated and/or liberated indigenous peoples. The Krios eventually blended with the local populations, with Krio women and children taking on the surnames of indigenous families. They have contributed to the ethnically/racially mixed peoples who live along the West Coast of Africa.