https://en.wikipedia.org/wiki/Eli_Sagan#Writings_and_teaching
now, paradoxically enough, this author on cannibalism (1974) was a successful businessman too
As Sagan (1974) pointed out, cannibalism (oral devouring) gave way to head-hunting (anal collecting), head-hunting to slavery (phallic domination), and slavery (though still not eradicated) to class oppression (wage slavery). It is far from clear if and how we will overcome the latter.
Carveth, Donald L.. Psychoanalytic Thinking: A Dialectical Critique of Contemporary Theory and Practice (Psychological Issues) (p. 234). Taylor and Francis. 2018, Kindle edition.