It's not that the people of Petite Martinique are outlaws. They've just never much cared for the laws of whichever government happened to be in control.
Whether under the flag of the British, French, or the government of Grenada, the residents of this itsy-bitsy (smaller than Central Park) Caribbean volcanic island have always done their own thing. Today, that includes being a storage and transfer point for all sorts of international contraband.
Petite Martinique is one-third of the tri-island state of Grenada, a country most famous for the brief 1983 US occupation, and for its annual celebration of Thanksgiving. The island is a dependency, meaning it's a territory under the jurisdiction of that country. Theoretically. It's an outpost of gray- and black-market trade, and, weirdly, it's a place you can actually go visit, if you're so inclined.