Political Science Quarterly (1962, September Vol. 77, No. 3) published Wolman's obituary.

Wolman was involved in finding employment for Hayek in the USA (see Dan and Claire Hammond's Making Chicago Price Theory: Friedman-Stigler Correspondence 1945-1957)

I recall seeing something (correspondence?) involving Wolman and Friedman in Milton's private office - but an electronic search of his archives doesn't register a hit (there may not be a separate file for 'Wolman').    
 
________________________________________
From: Societies for the History of Economics <[log in to unmask]> on behalf of Luca Fiorito <[log in to unmask]>
Sent: Wednesday, February 3, 2016 9:11 AM
To: [log in to unmask]
Subject: [SHOE] Leo Wolman

Dear all, I am working on Leo Wolman – a rather interesting figure who
started in the 1920s as a “militant” economist for the Amalgamated
Clothing Workers Union and ended up as a co-founder with Leonard Read
of the Foundation for Economic Education in 1946. Biographical info on
Wolman are fragmentary -- I am also editing his recollections but
there are some contradictions. According to my old notes (from my NY
years) there should be an entry on Wolman on the American National
Biography. Can anybody access it? I have tried here in Siena though
interlibrary loan but with no success.
Thanks in advance
Luca