Napoleon Chagnon's title promises a visit to two dangerous tribes: the Yanomamö and the Anthropologists. He provides a disjointed treatment. The larger part of the book takes the form of memoir, a return by Chagnon to the people he studied over the greater part of his career. The later chapters address the academic scandal surrounding Chagnon's work - and his place within the evolving discipline. Chagnon defends himself here - but he does not 'scientifically' study his anthropologist accusers: their violence (as opposed to that of the Yanomamö) is not explained.
Chagnon made the Yanomamö famous: his monograph (subtitled "The Fierce People') was widely studied (it was a highlight of the undergraduate Cultural Anthropology course I took). And of course the Yanomamö made Chagnon famous.
Chagnon's work was always controversial. He presented the Yanomamö as among the world's few remaining "Stone Age" people, largely isolated in the regions dividing Venezuela and Brazil. From here they subsistence agriculture from ever shifting villages. The Yanomamö were hardly unaffected by encounters with the outside -- they grew plantains and other crops that had been introduced to South America and prefered modern tools (including the machete and shotgun). Chagnon depicted the Yanomamö as a violent society, characterized by treacherous killings, inter-village raids, and systematic abduction of females. The Yanomamö were not Rousseau's noble savages.