(JTA) -- The brother of Yankel Rosenbaum, the visiting Jewish scholar murdered in the 1991 Crown Heights riots, is decrying the participation of the Rev. Al Sharpton in a synagogue's panel discussion on the event's 20th anniversary. Sharpton is scheduled to appear on a four-person panel titled "State of Black-Jewish Relations: Twenty Years after Crown Heights" Sunday event at the Hampton Synagogue in Westhampton Beach, N.Y. The synagogue's rabbi, Marc Schneier, is hosting the event and will be on the panel. “Rabbi Marc Schneier should take a damn good, hard look at the videos of the riots over the three-day...