John Conyers Jr., an advocate of liberal causes for five decades and the longest-serving African-American in the history of Congress, has died. He was 90. His death was confirmed by a family spokeswoman, Holly Baird. Mr. Conyers, a Democrat, resigned in 2017 after accusations of unwelcome sexual advances by two women. His lawyers denied the accusations, but both Paul Ryan, a Republican and then the Speaker of the House, and Nancy Pelosi, the House Democratic leader at the tim