Finding the right mix of hardened crime and genuine emotional stakes in gay gangster stories can be a bit of a hunt. A lot of stuff leans too far one way, either into pure action with a side of romance or melodrama in a criminal costume. You might have better luck looking at authors who specialize in gritty M/M romance rather than mainstream crime thrillers.
C.S. Poe's 'The Mysterious and Amazing Blue Billings' isn't a traditional gangster tale, but it's a good example of weaving criminal elements with a deeply emotional, supernatural-tinged core between two complex men. For a more direct, brutal take, K.A. Merikan's 'Sex & Mayhem' series is relentless—think biker gangs, violence, and fiercely possessive relationships that don't shy from darkness. Their characters are criminals first, and the love stories grow from that soil, messy and thorny.
Sometimes the best emotional depth comes from unexpected places. I stumbled onto 'Hush' by Tal Bauer, a political thriller with strong mafia undertones, and was surprised by how much the relationship's vulnerability hit me amidst all the conspiracy. It's less 'Godfather' and more about two broken men finding solace, but the danger feels real enough to scratch that itch.
Check tags like 'M/M romantic suspense,' 'dark romance,' and 'organized crime' on retailers. The indie and self-pub scene is really where this niche thrives, even if you have to sift through a few overly tropey ones to find the gems with real heart.