A natural follow-up to our Summer 2019 Sexual Politics issue, Communities #184 focuses on The Shadow Side of Cooperation. We explore problems and pitfalls, disappointments and betrayals, unintended outcomes of cooperative attempts ranging in impact from trivial to tragic. Authors’ stories describe the clash of idealism with reality, communication breakdowns, cultural patterning, internalized oppression, rights and boundary violations, founder’s syndrome, business and organizational struggles, power, ego, disempowerment, dysfunction, trauma, and strategies to address these and other challenges.