Spiraling violence plagues country a decade after historic peace deal with Latin America’s most powerful rebel group WSJ reports from the epicenter of deadly turf wars over lucrative drug corridors that have plunged Colombia into its worst violence in decades. Photo: Eve Hartley CATATUMBO, Colombia—Violent militias are at war over territory in this strip of land neighboring Venezuela, a key hub for coca-leaf cultivation and drug trafficking. State presence is scarce.