The pigs' appropriation of milk and apples for their own use, "the turning point of the story" as Orwell termed it in a letter to Dwight Macdonald, stands as an analogy for the crushing of the left-wing 1921 Kronstadt revolt against the Bolsheviks,  and the difficult efforts of the animals to build the windmill suggest the various Five Year Plans.
ðə pˈɪɡz ɐpɹˌoʊpɹɪˈeɪʃən ʌv mˈɪlk ænd ˈæpəlz fɔːɹ ðɛɹ ˈoʊn jˈuːs, "ðə tˈɜːnɪŋ pˈɔɪnt ʌvðə stˈoːɹi" æz ˈɔːɹwɛl tˈɜːmd ɪɾ ɪn ɐ lˈɛɾɚ tə dwˈaɪt məkdˈɑːnəld, stˈændz æz ɐn ɐnˈælədʒi fɚðə kɹˈʌʃɪŋ ʌvðə lˈɛftwˈɪŋ nˈaɪntiːnhˈʌndɹɪd twˈɛnti wˈʌn kɹˈɑːnstæt ɹᵻvˈoʊlt ɐɡˈɛnst ðə bˈɑːlʃɪvˌɪks,  ænd ðə dˈɪfɪkəlt ˈɛfɚts ʌvðɪ ˈænɪməlz tə bˈɪld ðə wˈɪndmɪl sədʒˈɛst ðə vˈɛɹiəs fˈaɪv jˈɪɹ plˈænz.