III e tigating the effects of prejudice, group identification, states of de-individuation,rnalld i11ferper onal aggression on conflicts or intergroup conflicts among football fans ofrnthe Big Four ill AAU main campus was worth studying. A survey study was conductedrnamong the fails through a questionnaire. A total of 266 fans participated in the studyrnincluding 104 Arsenal, 27 Chelsea, 40 Liverpool and 95 Manchester United fans. SocialrnIdentity Theory and Self Categorization Theory were at the heart of the issues underrnscrutiny. Stratified random sampling was employed to select the sample participants.rnThe objectives of study mainly included; (a) examining the formation of fan groupsrnbased on club types which lead to intergroup competition and prejudice, (b) to assessrnthe extent of prejudice, aggression and de-individuation among fans, (c) to investigaternthe effects of prejudice, de-individuation, anger and aggressiveness, and aggression onrnconflicts or intergroup conflicts among fans.rnThere was no significant effect of club type on prejudice, de-individuation, aggressionrnand intergroup conflicts. This keeps the Self Categorization Theory as non-determinantrnand that self categorization had no effect on the variables. However, Social IdentityrnTheory was found to have effect on prejudice, states of de-individuation, aggression,rnanger, and intergroup conflicts. Furthermore, tests of LSD and Scheffe revealed thatrnhigh identifiers were significantly different from low and medium identifiers on thernabove constituents. On the other hand, prejudice, de-individuation, anger andrnaggression were best predictors of conflicts among groups offans.