Index Librorum Prohibitorum

The Index librorum prohibitorum ("List of Prohibited Books") was a list of publications deemed heretical or contrary to morality by the Sacred Congregation of the Index (a former Dicastery of the Roman Curia), and Catholics were forbidden to read them without permission.[1]

There were attempts to censor individual books before the sixteenth century, notably the ninth-century Decretum Glasianum, but none of these were either official or widespread.[2] In 1559, Pope Paul IV promulgated the Pauline Index, which Paul F. Grendler believed marked "the turning-point for the freedom of enquiry in the Catholic world". After less than a year, it was replaced by the Tridentine Index which relaxed aspects of the Pauline Index that had been criticized and had prevented its acceptance.[1] The 20th and final edition appeared in 1948, and the Index was formally abolished on 14 June 1966 by Pope Paul VI.[3][4]

The stated aim of the list was to protect the faith and morals of the faithful by preventing the reading of theologically, culturally, or politically disruptive books. Such books included works by astronomers, such as Johannes Kepler's Epitome astronomiae Copernicanae which was on the Index from 1621 to 1835, by philosophers, such as Immanuel Kant's Critique of Pure Reason and editions and translations of the Bible that had not been approved. Editions of the Index also contained the rules of the Church relating to the reading, selling, and pre-emptive censorship of books.[5]
....
https://en.wikipedia.org/wiki/Index_Librorum_Prohibitorum

if your work ends up in the index, you would be in a pretty good company:

1600 Bruno, Giordano Opera omnia

1657, 1789 Pascal, Blaise Lettres provinciales (1657);
Pensées (pub. 1670), with notes by Voltaire

1663 Descartes, René Meditations (1641);
Les passions de l'âme (1649);
Opera philosophica. Donec corrig.;
+4 more

1676 Montaigne, Michel de Essays

1694, 1758 Milton, John Literae pseudo-senatus anglicani, Cromwellii reliquorumque perduellium nomine ac iussu conscriptae (1676);
Paradise Lost (1667)

703 La Fontaine, Jean de Contes et Nouvelles

1751, 1762 Montesquieu Lettres Persanes (1721);
De l'esprit des lois (1748)

1752, 1753, 1757,
1761, 1762, 1765,
1766, 1768, 1769,
1771, 1773, 1776,
1779 Voltaire Candide (1759);
Traité sur la tolérance (1763);
Lettres philosophiques (1733; revised 1778);
+38 more

etc etc a long list of "subversives" ... ending with

1956 de Beauvoir, Simone The Second Sex (1949);
The Mandarins (1954)

https://en.wikipedia.org/wiki/List_of_authors_and_works_on_t...