PROVIDENCE, R.I. -- A Dominican national authorities describe as the kingpin of a major fentanyl and cocaine trafficking ring admitted to his crimes Thursday in federal court.Ramon Delossantos, 25, pleaded guilty before U.S. District Court Judge John J. McConnell Jr. to one count each of conspiring to distribute more than 400 grams of the powerful and potentially deadly painkiller fentanyl and distribute more than 5 kilograms of cocaine in what federal prosecutors say was a well- [...]