This is the man I'm talking about:
http://godfather.wikia.com/wiki/BendinoI really don't think he is a crime boss and otherwise it would have been made clear. And besides, Don Tommasino already was the "Don" in this province.
Another example, but maybe not as strong, is Don Fanucci. In Part II and the novel it becomes clear that he wasn't a crime boss but just a loner. People in the Italian neighborhood adressed him as Don out of fear and respect because they thought he was 'connected' to Maranzalla and the Black Hand.
Also, Joey Zasa, who in fact was introduced as the "boss" of the Corleone's criminal faction was not adressed as "Don". That's because he was considered to be a 'small time enforcer' which means he wasn't respected enough to be adressed as "don" while Don Altobello was.
