431 A.2d 380 John W. Heffelfinger, Petitioner v. Commonwealth of Pennsylvania, Unemployment Compensation Board of Review, Respondent. United States Postal Service, Intervening Party Respondent. Commonwealth Court of Pennsylvania.Argued June 1, 1981 July 1, 1981. Unemployment compensation — Willful misconduct — Circumstantial evidence. 1. In an unemployment compensation case, circumstantial evidence, if substantial, is sufficient to […]