ɐ hˈɑːɹʃ kɹˈɪɾɪk ʌvðə wˈɔːɹən kəmˈɪʃən, hiː ˈɔːlsoʊ tˈɛstᵻfˌaɪd æt ðə nˈaɪntiːnhˈʌndɹɪd sˈɛvənti fˈaɪv juːnˈaɪɾᵻd stˈeɪts pɹˈɛzɪdənts kəmˈɪʃən ˌɔn sˌiːˌaɪˈeɪ æktˈɪvᵻɾiz wɪðˌɪn ðə juːnˈaɪɾᵻd stˈeɪts sˈʌmtaɪmz ɹᵻfˈɜːd tʊ æz ðə ɹˈɑːkɪfəlɚ kəmˈɪʃən.
A harsh critic of the Warren Commission, he also testified at the 1975 United States President's Commission on CIA activities within the United States (sometimes referred to as the Rockefeller Commission).