SAYING KADDISH. AT LAST. Holocaust survivor learns father's fate By ARON HELLER In 1942, 8-year-old Moshe Bar-Yuda walked hand-in-hand with his father to a collection point in his hometown in Slovakia and watched him being shipped off to a Nazi labor camp. The boy never saw him again, and for 66 years was left to wonder about his father's fate. Because of a newly opened Nazi archive, the mystery has been resolved. Bar-Yuda, now 74, was one of the first to obtain Nazi documents now available to the public after they were stashed away for more than 60 years in a secret German archive. Up to now, only limited queries were answered. The Bad Arolsen documents — transportation lists, Gestapo orders, camp registers, slave labor booklets, death books — contain references to about 17.5 million people, Jews and non-Jews. It is the largest registry of Holocaust victims ever. The archive showed that Bar-Yuda's father, Alfred Kastner, was killed in a Nazi gas chamber at the Majdanek de...