Memorials for the victims of the racist massacre at the Tops Friendly Markets grocery store in Buffalo, N.Y., on May 24.Kenny Holston/The New York Times News Service The gunman, an avowed white supremacist, who massacred 10 Black shoppers and workers at a Buffalo supermarket pleaded guilty Monday to murder and hate-motivated terrorism charges, guaranteeing he will spend the rest of his life in prison. Payton Gendron, 19, entered the plea Monday in a courthouse roughly two miles from the grocery store where he used a semiautomatic rifle and body armour to carry out a racist assault he hoped would help...