The article is devoted to the study of the tendency of feminization of spontaneous groups, the spread of gender biases and stereotypes in relation to them. It is established that initially the researchers characterized women in the crowd with partiality, but later, largely under the influence of the ideas of G. Le Bon, they began to attribute "female" characteristics to the crowd (variability of mood, impulsiveness of behavior, excessive feelings, tendency to suggestion, inability to reason, etc.). This contributed to the consideration of the crowd outside the social and situational context, legitimization of police violence, refusal to take into account the demands of the masses. The article states that the trend of feminization of the crowd was not long. The authors describe the features of its formation and ways of overcoming in science of the late XIX - early XX centuries. In particular, it is noted that the cessation of this trend was due to the emphasis on social factors of women's behavior in the crowd, the exclusion of pathological properties from the list of attributed ones, the gradual recognition of greater severity of individual differences in comparison with gender. The study is useful in the context of expanding the subject field of psychology of spontaneous social groups, as well as developing the conceptual foundations of a systematic approach to the phenomenon of the crowd.