On June 13, 1950, Lieber appeared with lawyer Milton H. Friedman (brother-in-law of New York State Justice Philip M. Halpern) before HUAC during executive session with House representatives Francis E. Walter, Burr P. Harrison, and Morgan M. Moulder. As with Sherman, HUAC read out excerpts from Chambers' testimony that mentioned their names or aliases. They also asked Lieber (as Sherman) whether he knew either Alger Hiss or J. Peters. (Chambers had recounted a meeting between, Lieber, himself, and Hiss on Lieber's farm: Lieber confirmed only ownership of 103-acre farm in Ferndale, Pennsylvania, in Bucks County from about 1935-1945.) They asked whether his clients included Louis Adamic, Howard Fast, V. J. Jerome, or Paul Robeson. They asked whether he knew Otto Katz (reputed to be involved in the death of Walter Krivitsky and in Soviet attempts to seize Chambers after defection) or Katz's associate Erwin Kisch. They asked whether he knew Osmond K. Fraenkel or whether he had ever contributed to a publication (probably Freies Deutschland) by Anna Seghers in Mexico. To all such questions, Lieber pleaded the Fifth on the grounds of self-incrimination. As he explained, he had also testified twice already in 1948 before the grand jury in New York City, which then indicted Hiss on two counts of perjury. During testimony, Lieber listed three by name of some 30 clients: Erskine Caldwell, Carey McWilliams, and Robert Coates.