"The simplest form of forced labor was that which colonial governments exacted to carry out “public works.” Labor for a given number of days per year had to be given free for these “public works”—building castles for governors, prisons for Africans, barracks for troops, and bungalows for colonial officials. A great deal of this forced labor went into the construction of roads, railways, and ports to provide the infrastructure for private capitalist investment and to facilitate the export of cash crops."