The "Dutch underworld" refers to the network of organized crime in the Netherlands, involving various illegal activities such as drug trafficking, human trafficking, and money laundering. This underground economy is often linked to international crime syndicates, making it a significant concern for law enforcement agencies. Key players in the Dutch underworld include criminal organizations like the Mocro Maffia, which is known for its involvement in the cocaine trade. The government has implemented strict measures to combat these activities, but the underworld remains resilient, adapting to law enforcement strategies and evolving over time.