From the Super Mario Wiki
The Pianta Syndicate is a criminal organization located in West Rogueport. The syndicate is made up of Piantas and, during the events of Paper Mario: The Thousand-Year Door, is led by Don Pianta and later on by Frankie and Francesca. The Pianta Syndicate is the rival organization to the Robbo Gang located on the East Side. Often, violence erupts between the two gangs, at least one instance of violence occurring as Toadsworth is meeting with Mario shortly after Princess Peach's disappearance from Rogueport where two members of the Pianta Syndicate gave two members of the Robbo Gang a "dirt nap." The Pianta Syndicate owns the Pianta Parlor, a place where people can gamble on games after acquiring membership cards. The Syndicate is based out of a building in a rundown alley, and the only way to gain access is to purchase a Dried Shroom followed by a Dizzy Dial from the Westside Goods. The store's owner will then inquire about the customer's favorite color; if the answer is yellow, the customer is granted access to the Syndicate Headquarters.
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