Einstein and Rifkin of the American Friends of the Fighters for the Freedom of Israel

Found here.

Transcript:

April 10, 1948
Mr. Shepard Rifkin
Exec.Director
American Friends of the Fighters
for the Freedom of Israel
149 Second Ave.
New York, N.Y.

Dear Sir:

When a real and final catastrophe should befall us in Palestine the first responsible for it would be the British and the second responsible for it the Terrorist organizations build up from our own ranks.

I am not willing to see anybody associated with those misled and criminal people.

Sincerely yours,

(Signed, 'A. Einstein')

Albert Einstein

For the second, more infamous letter on the occasion of Bergin's visit to the United States in November-December 1948, see here.