Just read (confession: scanned) “The Failure of the American Jewish Establishment” by Peter Beinart:
http://www.nybooks.com/articles/archives/2010/jun/10/failure-american-jewish-establishment/
What caught my eye, near the very end of the article, was this:
…the December 1948 letter from Albert Einstein, Hannah Arendt, and others to The New York Times, protesting right-wing Zionist leader Menachem Begin’s visit to the United States after his party’s militias massacred Arab civilians in the village of Deir Yassin.
Can anyone find the text (and context) of this letter?