%0 Journal Article %T Expansion of the self of activists and nonactivists involved in mass gatherings for collective action %A Anna Maria Zawadzka %A Tomasz Besta %J Group Processes & Intergroup Relations %@ 1461-7188 %D 2019 %R 10.1177/1368430217735903 %X Three studies were carried out in natural settings of mass gatherings to examine the interplay between activist identity and self-expansion and their relationship with willingness to engage in future collective actions. Study 1 was conducted among activists and supporters of equal rights for lesbian, gay, bisexual, and transgender (LGBT) individuals; Study 2 involved participants in a nationwide charity event; and Study 3 included members of a religious group. The results showed a statistically significant positive relationship between self-perceived activist identity and collective action (CA) tendency (Studies 1, 2, and 3). Moreover, the interaction between activist identity and self-expansion plays a role in predicting CA, with self-expansion related to willingness to engage in progroup behaviors when activist identity is low but not when activist identity is high (Studies 2 and 3). This interaction statistically significantly predicted collective action tendency when nonmaterialistic relational self-expansion and nonrelational self-expansion were considered but not when materialistic self-expansion was tested (Study 3) %K activism %K collective action %K group processes %K self-expansion %U https://journals.sagepub.com/doi/full/10.1177/1368430217735903