But I don't think that clan fueds are to be drawn among ethnic lines. Irish Catholics have blood fueds ( and not just the Travellers), Glasgow Scots, East End Londeners, Liverpudlians, among the poorer Dutch and German communities, French Canadians, Rednecks in Texas,...there have been clan and family feuds in all of those groups. Maybe not as deeply rooted as in the communities you mentioned, but they still exist.