The Efé are part of the indigenous people of D.R. Congo who labelled as Pygmies (they’ve lived in the region long before the Bantu migration and have been marginalised for hundreds of years). They are considered by mitochondrial DNA haplotype analysis to be one of the oldest people on earth.
The indigenous people also include the Baka who live in the North, the Mbuti/Bambuti, referring to the Sua, Efé and Asua ethnic groups as a collective who live mostly in the Ituri Forest, then you have the Twa (Mongo Twa, Kasai Twa and Great Lakes Twa. The Kasai Twa are also part of the Bakuba/Kuba people/the Kuba conglomeration)
The indigenous people also live in Rwanda, Burundi, Uganda, the Central African Republic, Cameroon, Equatorial Guinea, Gabon, the Republic of Congo, Angola, Botswana, Namibia, and Zambia where they face ethnic/institutional discrimination.