Australian Federal Police say the overseas arrest of Kazem Hamad this week is a "significant" breakthrough.

Iraqi authorities say the arrest was made on behalf of Australian law enforcement, accusing Hamad of being "one of the most dangerous wanted men in the world".

So, what might be next for Melbourne's fiery so-called "tobacco wars"?

• Guest: Dr James Martin, Associate Professor in Criminology, Deakin University.
• Producer: Oscar Coleman