Mafia Headquarter is the Majestic Hotel, located in the south of Central Park. Mafia Gang is the black team, with black vehicles. If it is the first time that you connect to CPGW server, use /m command to join this gang.
Use /hq in a taxi to go back to Mafia Headquarter, the Nice Majestic Hotel where you will find (black) vehicles owned by your team.
Mafia walkie talkie channel: /tpm <message> With this command your message is only visible by your Mafia team mates.
Bellow, images of the available Mafia skins at /modo clothes shop.
Mafia members usually meet in /perestroika cabaret. Indeed this small bar is owned by Mafia Gang.