So Gangsters Organized Crime is available but Gangsters 2 is not, any possibility of making this happen?

Here you go, Gangsters 2.

Pretty much up to the publisher.

You can add your vote to the request located here:

https://www.gog.com/wishlist/games/gangsters_2_vendetta

Gangsters 2 appears to have been published by Eidos. I seem to recall they're one of the publishers who prefer DRM on their programs. If that's correct, it probably won't happen.

Linkie: https://www.gog.com/forum/general/release_hitman_3_contracts/post34