In it, he identifies the real problem and outlines the only real solution.
Here are some of the highlights of Pius XI's intellectual evisceration of the Illuminati (who, in his day, were most comfortable under the banner of Bolshevism):
"A pseudo-ideal of justice, of equality and fraternity in labor impregnates all its doctrine and activity with a deceptive mysticism, which communicates a zealous and contagious enthusiasm to the multitudes entrapped by delusive promises. This is especially true in an age like ours, when unusual misery has resulted from the unequal distribution of the goods of this world. This pseudo-ideal is even boastfully advanced as if it were responsible for a certain economic progress. As a matter of fact, when such progress is at all real, its true causes are quite different, as for instance the intensification of industrialism in countries which were formerly almost without it, the exploitation of immense natural resources, and the use of the most brutal methods to insure the achievement of gigantic projects with a minimum of expense..."
"According to this doctrine there is in the world only one reality, matter, the blind forces of which evolve into plant, animal and man. Even human society is nothing but a phenomenon and form of matter, evolving in the same way. By a law of inexorable necessity and through a perpetual conflict of forces, matter moves towards the final synthesis of a classless society. In such a doctrine, as is evident, there is no room for the idea of God; there is no difference between matter and spirit, between soul and body; there is neither survival of the soul after death nor any hope in a future life..."
"What would be the condition of a human society based on such materialistic tenets? It would be a collectivity with no other hierarchy than that of the economic system. It would have only one mission: the production of material things by means of collective labor, so that the goods of this world might be enjoyed in a paradise where each would "give according to his powers" and would "receive according to his needs." Communism recognizes in the collectivity the right, or rather, unlimited discretion, to draft individuals for the labor of the collectivity with no regard for their personal welfare; so that even violence could be legitimately exercised to dragoon the recalcitrant against their wills. In the Communistic commonwealth morality and law would be nothing but a derivation of the existing economic order, purely earthly in origin and unstable in character. In a word. the Communists claim to inaugurate a new era and a new civilization which is the result of blind evolutionary forces culminating in a humanity without God."
"How is it possible that such a system, long since rejected scientifically and now proved erroneous by experience, how is it, We ask, that such a system could spread so rapidly in all parts of the world?"
1."Communists take advantage of the present world-wide economic crisis to draw into the sphere of his influence even those sections of the populace which on principle reject all forms of materialism and terrorism."
2."The preachers of Communism are also proficient in exploiting racial antagonisms and political divisions and oppositions."
3."[Utilizing] a propaganda so truly diabolical that the world has perhaps never witnessed its like before. It is directed from one common center. It is shrewdly adapted to the varying conditions of diverse peoples. It has at its disposal great financial resources, gigantic organizations, international congresses, and countless trained workers. It makes use of pamphlets and reviews, of cinema, theater and radio, of schools and even universities. Little by little it penetrates into all classes of the people and even reaches the better-minded groups of the community..."
4."...the conspiracy of silence on the part of a large section of the non-Catholic press of the world. We say conspiracy, because it is impossible otherwise to explain how a press usually so eager to exploit even the little daily incidents of life has been able to remain silent for so long about the horrors perpetrated in Russia, in Mexico and even in a great part of Spain..."
"...In making these observations it is no part of Our intention to condemn en masse the peoples of the Soviet Union. For them We cherish the warmest paternal affection. We are well aware that not a few of them groan beneath the yoke imposed on them by men who in very large part are strangers to the real interests of the country. We recognize that many others were deceived by fallacious hopes. We blame only the system, with its authors and abettors who considered Russia the best-prepared field for experimenting with a plan elaborated decades ago, and who from there continue to spread it from one end of the world to the other..."