SDK is a french graffiti crew. SDK stands for Sellings drugs to kids. SDK is Allied to the Swedish graffiti crew WUFC. Because of them hanging with WUFC they also appear in alot of swedish graffiti movies. They also appear in french movies and they made the "Dirty Handz" movies.
The writers Solei, Riot and Inxs met WUFC when being in sweden for a exhibition in Malmö. And they went on to Stockholm. They were supposed to live with a writer namned Kaos from the swedish crew VIM(Vandals In Motion) but he couldn't put them up so he called his friend Uzi from WUFC and asked him if they could stay at his place, and they did. WUFC had mostly been painting trains that summer and had the routine going and they took SDK out every night. The two crews clicked.