The Crowd: A Study of the Popular Mind

The founding text of crowd psychology. Le Bon argues that when individuals enter a crowd, they descend to a lower mental stage — emotive, impulsive, irrational, credulous, suggestible — and become susceptible to the magnetic influence of leaders who deploy affirmation, repetition, and contagion. Published 1895; translated into 17+ languages in Le Bon's lifetime; cited as a direct influence by Hitler, Mussolini, Lenin, Trotsky, and Freud (whose 1921 Group Psychology and the Analysis of the Ego is essentially a reply). The book that every 20th-century propaganda theorist either built on or against.

1. Preface (pp. xi–xx in Penguin) — Le Bon's actual thesis in 8 pages 2. Book I: The Mind of Crowds (Ch 1–3) — the unconscious personality, the collective mind, the leader's role 3. Book II: The Sentiments and Morality of Crowds — what's amplified, what's flattened 4. Book III: The Ideas, Reasoning Power, and Imagination of Crowds — the mental mechanics 5. Skip the rest unless you want the case-study catalogue (criminal juries, electoral bodies, parliamentary assemblies)

1. Affirmation — bare, repeated assertion, no argument 2. Repetition — same assertion, again and again, until it settles into the collective unconscious 3. Contagion — the assertion spreads from one mind to the next like a virus; once it reaches critical mass, individuals who would have rejected it in private now accept it as obvious