Arthur Bestor, one of the nation's leading authorities on constitutional law and a UW history professor from 1962 to 1976, died Dec. 13, 1994, of lung cancer at his Seattle home. He was 86. He was especially known for his research into "communitarian" or Utopian societies, such as the Oneida Community, that flourished in the 19th century. Born in Chautauqua, N.Y., he received his bachelor's and doctorate degrees from Yale. A lifetime member of Yale's Elizabethan Society, he twice received Fulbright Fellowships and a Guggenheim. He taught at Yale, Columbia, Stanford, Queens College of Oxford Univ., and Southern Indiana Univ. and the University of Washington.