ðə ɹˈʌʃən sˈiːkɹᵻt tˈɛɹɚɹ ɪn nˈaɪntiːnhˈʌndɹɪd θˈɜːɾi wˈʌn lˈɛd tə swˈiːpɪŋ ɚɹˈɛsts ʌv hˈʌndɹɪdz ʌv sˈoʊviət ˈeɪdʒənts ænd sˈɪmpəθˌaɪzɚz ɪn pˈɜːʒə æz wˈɛl æz ˈʌðɚ nˌɪɹ ˈiːstɚn kˈʌntɹiz ænd kˈɔːzd ɐ ʃˈɑːɹp dɪtˌiəɹɪɹˈeɪʃən ʌv mˈɑːskoʊz ɹᵻlˈeɪʃənz wɪð ɹᵻzˈæ ʃˈɑː.
The Russian Secret Terror in 1931 led to sweeping arrests of hundreds of Soviet agents and sympathisers in Persia as well as other Near Eastern countries and caused a sharp deterioration of Moscow's relations with Rezā Shāh.