trib·al·ism 
/ˈtraɪbəˌlɪzəm/ noun
/ˈtraɪbəˌlɪzəm/ noun [noncount] often disapproving : loyalty to a tribe or other social group especially when combined with strong negative feelings for people outside the group
▪ Tribalism within the group is strong. ▪ the corrupting influence of tribalism
▪ Tribalism within the group is strong. ▪ the corrupting influence of tribalism
