ɐn ˈɛstᵻmˌeɪɾᵻd twˈɛnti,zˈiəɹoʊzˈiəɹoʊ zˈiəɹoʊ kˈɑːdɚz ænd sˈɪks,zˈiəɹoʊzˈiəɹoʊ zˈiəɹoʊ tɹˈeɪnd wˈɜːkɚz bɪɡˈæn spˈaɪɪŋ ɔnðə bˈɪznəs ɐfˈɛɹz ʌv fˈɛloʊ sˈɪɾɪzənz.
An estimated 20,000 cadres and 6,000 trained workers began spying on the business affairs of fellow citizens.