Joel Dowen, a 46-year-old resident of Concord, California, has been handed an 18-year federal prison sentence following a series of violent crimes that culminated in a federal courtroom in Oakland. US District Judge Jon S Tigar delivered the sentence on 7 August 2026 after Dowen pleaded guilty to all counts, which encompassed a ruthless extortion scheme, an armed assault on federal law enforcement officers, extensive narcotics manufacturing, and…