Humanum Genus, Pope Leo XIII’s great encyclical warning against Freemasonry, was promulgated in 1884. In it, the Pope condemned Masonry and other secret societies in the most direct and unambiguous way. The scathing nature of his reprisal can be evaluated by the response from Masons of that time.
From the Bulletin of the Symbolic Scottish Grand Lodge:
Freemasonry cannont help but thank the Supreme Pontiff of the last encyclical. Leo XIII, with unquestionable authority, and wth great luxury of evidence has demonstrated once again that there is an unbridgeable gulf between the Church of which he is the representative, and the Revolution, of which Freemasonry is the right arm. It is good that the skeptics cease to entertain vain hopes. All must get used to the new order which does not recognise any other foundation than that of science and human reason, in the spirit of authority and spirit of liberty.
Enrico Delassus, “Il problema dell’ora presente”, Desclèe e C. Tipografi-Editori 1907, vol. 1, p 39. (Via Fr Villa.)
Contrast this appraisal with laudatory comments from the Masons in our present day. The following is a press release from Italy’s Grand Lodge, made after the election of Jorge Bergoglio in 2013.
The Catholic Church has chosen as Pope the Jesuit Jorge Mario Bergoglio who assumed the name of Francis. A clear-cut choice, away from the logic of the Roman Curia and of the temporal power. From the first moment on, Pope Francis, a man who comes “nearly from the end of the world,” rejecting the ermine robe and gold cross and replacing it with an iron cross, made his first tangible act. In his first words of greeting he fostered a desire for dialogue with the world and with mankind, nurturing the vivid hope for laymen and nonbelievers that change is underway. Maybe this is really what the world expects and what it expected. A new Church that knows how to reconnect love with truth in a confrontation among institutions not entrenched in the defense of their own power. It is that same hope for which the world — and especially Latin America, where the Masons Simon Bolivar, Salvador Allende and the same Giuseppe Garibaldi [especially while in Brazil] among the many who have given liberty to those peoples — has always longed for.
A message that Freemasonry itself perceives a sharp break with the past and one which is turned now to listening to the poor, the marginalized and the weakest. To the new Pontiff we send our best wishes for his good work for years to come.
Luciano Nistri, Grand Master GLVDI
(As found at OnePeterFive)

You speak of Leo 13th as “pope”, in this article. I have found this man to be an antipope, via the well researched works of RJMI, the Sole Ruler of the Catholic Church. You must chose your “pope”! These two cannot be pope: Saint Pope Leo the Great and Antipope Leo XIII. It is a mortal sin for you to not read this article, based on facts and years of research: it is the mortal sin of “impugning the known truth” and of “affected ignorance”. A man of good will, when he is given truths, such as this well researched work on Leo XIII, will conclude that that Chair is Vacant, since 1130: https://www.johnthebaptist.us/jbw_english/audios/lectures/rjmi/alr0080_ac_jew_ga_americanism_rev4-2014.mp3 “During this Great Apostasy God will never give Catholics a good pope because they do not deserve him, because they would not obey him. The heresy of Americanism and its false prophet Fr. Hecker and its promoters, such as Gibbons, Ireland, Keane, and McCormack, prove how *wicked Apostate Antipope Leo XIII* was for not taking effective action to stop this heresy. Leo did not condemn Hecker’s works or any book by name for teaching Americanism nor denounce anyone by name as a heretic for teaching and promoting Americanism. That is why Americanism is known as a phantom heresy. And these phantoms, like Gibbons, Ireland, and Keane, continued to teach, promote, and practice the heresy of Americanism to the point that it blossomed into modernism. (This audio was previously titled Asr157.)”…..”One of the modern and weak so-called popes, who was actually an apostate antipope, is Leo XIII who was weak and compromising with the Americanist heretic bishops of the USA, such as Gibbons, Ireland, and Keane.”…. https://www.johnthebaptist.us/jbw_english/documents/menus/menu_audios_lectures_rjmi.html#Assisi-1893 (You will be cursed by God, if you reject this holy admonition, for sure.)
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