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Also "Counter Missionary", "Antimissionary" denotes an individual Non-Messianic Jew or gentile (i.e., a Jew or gentile who is not a Christian) who will delibarately go out of his or her way to persecute Christians-- in particular, Jewish Christians.
An infamous Antimissionary organization is Jews for Judaism, supported by websites such as JewFAQ.
by Nickidewbear August 19, 2011