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Hi Paul -- thanks for posting to History Hub!
The best way to find public testimony before the House Committee on Un-American Activities (HUAC) is the Cumulative Index to Publications of the Committee on Un-American Activities: 1938-1954 and then the Supplement to Cumulative Index to Publications of the Committee on Un-American Activities: 1955 through 1960 -- both of which are freely available online through the Internet Archive.
I searched both of these volumes for 'Robert Colodny' and see only one reference in the first volume: "eb 141" -- which maps to House Report No. 378: The Communist "Peace" Offensive (available online via Google Books). Colodny's name is mentioned on page 141 of the report.
I also checked our finding aid for House Committee on Un-American Activities executive session transcripts in our holdings (our finding aid is arranged alphabetically by witness name) and I did see an entry for Robert G. Colodny testifying on June 1, 1961.