The Gonzalez Syndicate is a Hispanic syndicate headed by Gonzalez. They appear in a few missions in Grand Theft Auto: Vice City Stories, when Victor Vance is sent by Reni Wassulmaier to help Gonzalez and his men fight through Diaz' Gang to get to the docks in Vice Port. Another includes Gonzalez' men trying to stop Diaz's drug deal with the DEA.
They are not seen in Grand Theft Auto: Vice City but Gonzalez is seen talking to men that look like the Diaz' Gang minutes before his death so the Gonzalez Syndicate was probably with the Diaz' Gang in Grand Theft Auto: Vice City.
GTA Vice City Stories