On April 14, 1961, the camp was reopened as a work camp by the Ministry of Overseas Territories, labeled "Chão Bom Work Camp". This phase coincided with the construction of the first stone pavilions and the reconfiguration of the protections to fortress-like protections. Its purpose was to imprison militants of the national liberation war from the Portuguese colonial war in Angola, Guinea-Bissau and Cape Verde, isolating and torturing them. On July 17, 1961 it was expanded, in 1962 new buildings were constructed, and in 1967 a wall was built to increase security. According to Pedro Martins, then a Cape Verdean political prisoner, the Concentration Camp was "a place planned, designed, and built to make people suffer". According to him, the place where the Cape Verdeans were detained was so small that they were accommodated "like canned sardines". Regarding food, he says that "[c]achupa with a few traces of tuna was served to us daily," with minimal variation, and that when they refused to eat spoiled fish "that even dogs would not be able to eat," their meals were cut off. Luandino Vieira was one of the most prominent figures to be in Tarrafal during this phase, being imprisioned from 1964 to 1972. In 1965, the Portuguese Writers Society awared him a prize, which resulted in the vandalization of its headquarters and its ilegalization.