Identity fusion: the interplay of personal and social identities in extreme group behavior.

@article{Swann2009IdentityFT,
  title={Identity fusion: the interplay of personal and social identities in extreme group behavior.},
  author={William B. Swann and {\'A}ngel G{\'o}mez and Daniel Conor Seyle and Jos{\'e} Francisco Morales and Carmen Huici},
  journal={Journal of personality and social psychology},
  year={2009},
  volume={96 5},
  pages={
          995-1011
        }
}
The authors propose that when people become fused with a group, their personal and social identities become functionally equivalent. Two hypotheses follow from this proposition. First, activating either personal or social identities of fused persons should increase their willingness to endorse extreme behaviors on behalf of the group. Second, because personal as well as social identities support group-related behaviors of fused persons, the 2 forms of identity may combine synergistically… 
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