ðə fˈɜːst sˈiːnjɚɹ ˈɑːɡpuː ˈɑːfɪsɚ tə dᵻfˈɛkt tə ðə wˈɛst nˈaɪntiːnhˈʌndɹɪd θˈɜːɾi, hiː ɹˈoʊt ɹˈɛvɪlətˌoːɹi bˈʊks, wˌɪtʃ lˈɛd tə mˈæsɪv ɚɹˈɛsts ʌv sˈoʊviət ɪntˈɛlɪdʒəns ˈæsɛts əkɹˌɑːs ðə nˌɪɹ ˈiːst ænd sˈɛntɹəl ˈeɪʒə.
The first senior OGPU officer to defect to the West (1930), he wrote revelatory books, which led to massive arrests of Soviet intelligence assets across the Near East and Central Asia.