The authors tested a model in which a group's association with an offender impacts collective imprisonment indirectly via dispositional attribution and blame to the group, culture does so indirectly via blame, and severity of outcome directly determines imprisonment. In two experiments, Easterners and Westerners made dispositional attribution, blame, and imprisonment responses to an offender's group associated with him by commission versus omission and with high versus low severity of outcome for the victim. Commission generated higher responses to the group than did omission. Collective blame Correspondence should be sent to Ramadhar Singh, Organizational Behavior and Human Resource Management Area,