Karen Ferguson, the longtime labor lawyer who fought to protect workers’ pensions and retirement plans, has died at the age of 80. Ferguson was head of the Pension Rights Center for more than four decades, where she successfully lobbied Congress for pension reforms while helping thousands of workers recover their retirement benefits. Ferguson got her start in Washington, D.C., as one of “Nader’s Raiders” — a group of lawyers who joined consumer advocate Ralph Nader’s Public Interest Research Group in the 1970s.