Michaela Pfundmair is Professor of Intelligence Psychology at the Federal University of Administrative Sciences in Berlin, Germany. Her research focuses on the consequences of social exclusion and the psychology of terrorist radicalization. Andrew Hales is Professor of Psychology at the University of Mississippi, USA. He researches the many ways people influence one another, including social ostracism. Kipling D. Williams is Distinguished Professor of Psychological Sciences at Purdue University, USA. An expert on ostracism and social judgement, he authored and co-edited numerous books on the subject.

• Introduction Michaela Pfundmair, Andrew Hales and Kipling D. Williams; 1. Ostracism and extremism: how extreme groups can address threatened needs Andrew Hales, Natasha R. Wood and Kipling D. Williams; 2. Exclusion and radicalization: the role of individual differences in the relation between exclusion and radicalization Emma A. Renström and Hanna Bäck; 3. In the realm of action: social exclusion as a catalyst for terrorism Michaela Pfundmair; 4. Seeking the self in the extreme: white extremism, exclusion, and threat to self Verena Graupmann, Eric D. Wesselmann; 5. Buying the blackpill: perceived exclusion and the psychology of incels Gregory J. Rousis and William B. Swann; 6. Extremism and exclusion: the role of the quest for significance Molly Ellenberg and Arie W. Kruglanski; 7. Divided groups, polarized identities, and extremist behavior: the role of exclusion-contingent self and identity uncertainty Joseph A. Wagoner and Michael A. Hogg; 8. It's the group, not just the individual: social identity and its link to exclusion and extremism Bertjan Doosje, Allard R. Feedes and Liesbeth Mann; 9. 'Who do they think we are?!': how Status Indignity and exclusion can motivate radicalization Johannes Nils Rasmus Möring and Felicia Pratto; 10. The exclusion-extremism link in non-WEIRD populations Juana Chinchilla and Ángel Gómez Jiménez; 11. Rejection and serious aggression: hurt people hurt people Robin M. Kowalski and Mark R. Leary; 12. Chronic social exclusion, radicalization, and extremism Marco Marinucci and Paolo Riva; 13. Connecting conspiracy beliefs and experiences of social exclusion Roland Imhoff.

Michaela Pfundmair is Professor of Intelligence Psychology at the Federal University of Administrative Sciences in Berlin, Germany. Her research focuses on the consequences of social exclusion and the psychology of terrorist radicalization. Andrew Hales is Professor of Psychology at the University of Mississippi, USA. He researches the many ways people influence one another, including social ostracism. Kipling D. Williams is Distinguished Professor of Psychological Sciences at Purdue University, USA. An expert on ostracism and social judgement, he authored and co-edited numerous books on the subject.

• Introduction Michaela Pfundmair, Andrew Hales and Kipling D. Williams; 1. Ostracism and extremism: how extreme groups can address threatened needs Andrew Hales, Natasha R. Wood and Kipling D. Williams; 2. Exclusion and radicalization: the role of individual differences in the relation between exclusion and radicalization Emma A. Renström and Hanna Bäck; 3. In the realm of action: social exclusion as a catalyst for terrorism Michaela Pfundmair; 4. Seeking the self in the extreme: white extremism, exclusion, and threat to self Verena Graupmann, Eric D. Wesselmann; 5. Buying the blackpill: perceived exclusion and the psychology of incels Gregory J. Rousis and William B. Swann; 6. Extremism and exclusion: the role of the quest for significance Molly Ellenberg and Arie W. Kruglanski; 7. Divided groups, polarized identities, and extremist behavior: the role of exclusion-contingent self and identity uncertainty Joseph A. Wagoner and Michael A. Hogg; 8. It's the group, not just the individual: social identity and its link to exclusion and extremism Bertjan Doosje, Allard R. Feedes and Liesbeth Mann; 9. 'Who do they think we are?!': how Status Indignity and exclusion can motivate radicalization Johannes Nils Rasmus Möring and Felicia Pratto; 10. The exclusion-extremism link in non-WEIRD populations Juana Chinchilla and Ángel Gómez Jiménez; 11. Rejection and serious aggression: hurt people hurt people Robin M. Kowalski and Mark R. Leary; 12. Chronic social exclusion, radicalization, and extremism Marco Marinucci and Paolo Riva; 13. Connecting conspiracy beliefs and experiences of social exclusion Roland Imhoff.

Michaela Pfundmair is Professor of Intelligence Psychology at the Federal University of Administrative Sciences in Berlin, Germany. Her research focuses on the consequences of social exclusion and the psychology of terrorist radicalization. Andrew Hales is Professor of Psychology at the University of Mississippi, USA. He researches the many ways people influence one another, including social ostracism. Kipling D. Williams is Distinguished Professor of Psychological Sciences at Purdue University, USA. An expert on ostracism and social judgement, he authored and co-edited numerous books on the subject.

• Introduction Michaela Pfundmair, Andrew Hales and Kipling D. Williams; 1. Ostracism and extremism: how extreme groups can address threatened needs Andrew Hales, Natasha R. Wood and Kipling D. Williams; 2. Exclusion and radicalization: the role of individual differences in the relation between exclusion and radicalization Emma A. Renström and Hanna Bäck; 3. In the realm of action: social exclusion as a catalyst for terrorism Michaela Pfundmair; 4. Seeking the self in the extreme: white extremism, exclusion, and threat to self Verena Graupmann, Eric D. Wesselmann; 5. Buying the blackpill: perceived exclusion and the psychology of incels Gregory J. Rousis and William B. Swann; 6. Extremism and exclusion: the role of the quest for significance Molly Ellenberg and Arie W. Kruglanski; 7. Divided groups, polarized identities, and extremist behavior: the role of exclusion-contingent self and identity uncertainty Joseph A. Wagoner and Michael A. Hogg; 8. It's the group, not just the individual: social identity and its link to exclusion and extremism Bertjan Doosje, Allard R. Feedes and Liesbeth Mann; 9. 'Who do they think we are?!': how Status Indignity and exclusion can motivate radicalization Johannes Nils Rasmus Möring and Felicia Pratto; 10. The exclusion-extremism link in non-WEIRD populations Juana Chinchilla and Ángel Gómez Jiménez; 11. Rejection and serious aggression: hurt people hurt people Robin M. Kowalski and Mark R. Leary; 12. Chronic social exclusion, radicalization, and extremism Marco Marinucci and Paolo Riva; 13. Connecting conspiracy beliefs and experiences of social exclusion Roland Imhoff.