I wrote a thesis some years ago about gangsters in 1920s Sydney. My uncle Clarrie was a well-known gangster of the period and so was his cousin Jack. I have a great photo of them walking down George Street Sydney just before Clarrie was murdered. He and Jack were pretty well 'joined at the hip' whenever Clarrie got out of gaol (which wasn't often!) and were involved in gun battles, standovers and shakedowns, etc., together. I have a couple of photos of Jack when he was elderly, as well, sent to me by another of his relatives, Jim Janz, who lives in Queensland. I think he's still alive.
I'm desperately searching for any other photos of Clarrie that may survive somewhere out there. Most of the Thomas family photos were list in a bushfire in the 1950s.
Let me know what you're interested in.