This study, conducted in Berkeley, California, was designed to test the hypothesis that socially integrated high school students would not be involved in interracial violence and conflict, while students who were socially isolated would. Data were collected by means of a questionnaire, sent to the 1970 graduating class of Berkeley High School, which asked the students to report on extortions, fights, and verbal threats. The responding students were divided into six social integration groups: (1) Asian- socially isolated; (2) black-socially isolated; (3) white- socially isolated; (4) Asian-socially integrated; (5) black- socially integrated; and, (6) white-socially integrated. The set of questions on verbal threats offered no evidence in support of or against the hypothesis under test. Threats were extremely infrequent. Data generated from responses to questions regarding fights did not support the hypothesis. Fighting occurred more within racial groups than across racial groups. Data on student extortions partially supported the hypothesis. Extortion was practiced mainly by blacks against whites and Asians but seemed unrelated to levels of integration. (MK)