Hippolytus [c. AD 170-235] was a Presbyter in Rome who boldly denounced immorality (even if it meant standing against the church leaders of his day).
In the following excerpt from one of his letters, he criticizes another Bishop who allowed abortions.
And the hearers of Callistus being delighted with his tenets, continue with him, thus mocking both themselves as well as many others, and crowds of these dupes stream together into his school.
Wherefore also his pupils are multiplied, and they plume themselves upon the crowds (attending the school) for the sake of pleasures which Christ did not permit. But in contempt of Him, they place restraint on the commission of no sin, alleging that they pardon those who acquiesce (in Callistus’ opinions).
For even also he permitted females, if they were unwedded, and burned with passion at an age at all events unbecoming, or if they were not disposed to overturn their own dignity through a legal marriage, that they might have whomsoever they would choose as a bedfellow, whether a slave or free, and that a woman, though not legally married, might consider such a companion as a husband.
Whence women, reputed believers, began to resort to drugs for producing sterility, and to gird themselves round, so to expel what was being conceived on account of their not wishing to have a child either by a slave or by any paltry fellow, for the sake of their family and excessive wealth.
Behold, into how great impiety that lawless one has proceeded, by inculcating adultery and murder at the same time! And withal, after such audacious acts, they, lost to all shame, attempt to call themselves a Catholic Church!
“Refutation of all Heresies”, Book IX, Chapter VII