<P> After WWII, the Office of Special Investigations created a watchlist of suspected Axis collaborators and persecutors that are banned from entering the U.S. While they have added over 60,000 names to the watchlist, they have only been able to identify under 100 Japanese participants . In a 1998 correspondence letter between the DOJ and Rabbi Abraham Cooper, Eli Rosenbaum, director of OSI, stated that this was due to two factors . (1) While most documents captured by the U.S. in Europe were microfilmed before being returned to their respective governments, the Department of Defense decided to not microfilm its vast collection of documents before returning them back to the Japanese government . (2) The Japanese government has also failed to grant the OSI meaningful access to these and related records after the war, while European countries, on the other hand, have been largely cooperative . The cumulative effect of which is that information pertaining to identifying these individuals is, in effect, impossible to recover . </P> <Ul> <Li> Forest Sea (Pol . Leśne morze) (1960), a novel by a Polish writer and educator Igor Newerly . The first book published outside Asia which refers to atrocities committed in the Unit . </Li> <Li> The Man Who Ended History: A Documentary (2011), a novella published in The Paper Menagerie book by American writer and Chinese translator Ken Liu: A scientific discovery allows a victim's descendant to go back in time to witness and learn the truth about the atrocities committed in the Unit . </Li> <Li> Tricky Twenty - Two, a novel in the Stephanie Plum series by Janet Evanovich, features as its antagonist a deranged biology professor who is obsessed with Unit 731 and is attempting to re-create the Unit's bubonic plague dispersals . </Li> </Ul> <Li> Forest Sea (Pol . Leśne morze) (1960), a novel by a Polish writer and educator Igor Newerly . The first book published outside Asia which refers to atrocities committed in the Unit . </Li> <Li> The Man Who Ended History: A Documentary (2011), a novella published in The Paper Menagerie book by American writer and Chinese translator Ken Liu: A scientific discovery allows a victim's descendant to go back in time to witness and learn the truth about the atrocities committed in the Unit . </Li>

Japan was known as the world's workshop in the years after world war ii because it