We are introduced to the Mano Blanco, MANO is an acronym for Movimiento de Acción Nacionalista Organizado (Movement of Organized Nationalist Action).
Mano Blanca is a real death squad which was formed in 1966 in Guatemala.
Dahlia Mendez was played by actress Martika who was also a American pop singer and song writer with two internationally successful albums in the late 1980s and early 1990s. This is why Dahlia was a singer in the show.