I don't think there would be any explanation in The Hoods by Harry Grey because I believe that book ends with the death of the gang in the last liquor run in 1933. I'm not sure that the novelization of the film adds any insight. I think the viewer is supposed to just read in between the lines. Max is a powerful political figure, and still connected to the mob. He has a lot of resources available to him to track someone down. A lot times in the gangster and noir genres, you can run but you can't hide for long. Most of the time they find ya and they get ya.
What he said.