The ringleader of an international cocaine trafficking ring pleaded guilty in federal court to a cocaine dealing conspiracy.

Richard Wallstrum, 45, Santa Rosa, pleaded guilty to operating a continuing criminal enterprise, distribution of cocaine and lying on a tax return, according to Assistant U.S. Attorney Matthew Pavone.Wallstrum was one of 11 people charged in December 1987 with running a cocaine operation between California and South America from 1974 to 1984. The operation also did business in Oregon, Hawaii, Colorado, Florida, Nevada, Utah and New Mexico, he said.