Question: Who wrote the theory and practice of oligarchical collectivism?
Disambiguated questions and answers: question: Who wrote the theory and practice of oligarchical collectivism according to Winston Smith?
Who wrote the theory and practice of oligarchical collectivism according to O'Brien?
answer: Emmanuel Goldstein
a committee that included himself
a committee
Natural Questions answer: Emmanuel Goldstein (from the Wikipedia article "The Theory and Practice of Oligarchical Collectivism")