Sharing a tender moment are T.R. Knight and Lara Pulver as Leo and Lucille Frank in the riveting musical “Parade,” playing at the Mark Taper Forum through Nov. 15. The riveting story by Alfred Uhry is based on the actual 1915 lynching in Atlanta of Frank, a New York Jew, for allegedly raping a 13-year old factory girl. The play, with music by Jason Robert Brown, probes the dark undertones of anti-Semitism. mob violence, and historic North-South hostility.