1 Corinthians 5:13 But those who are outside God judges. Therefore “put away from yourselves the evil person.
The worst and the most scary judgment is when two members were delivered by Saint Paul to Satan.
1 Timothy 1:20 of whom are Hymenaeus and Alexander, whom I delivered to Satan that they may learn not to blaspheme.
Their activities are done not in the open but whispered in a corner which temporarily escapes attention but revealed in the end.
2 Timothy 2:17 And their message will spread like cancer. Hymenaeus and Philetus are of this sort,
The apostles told beforehand that there would be mockers in the last time who would walk according to their own ungodly lusts. These are sensual persons, who cause divisions in the Church, not having the Spirit.
Jude 1:16 These are grumblers, complainers, walking according to their own lusts; and they mouth great swelling words, flattering people to gain advantage.
And this is not just a thing of the past. The putting away of members who fight against the teachings and delivering them to Satan, are still on-going inside the Church of God.
It's a continuing process, started by a whisper in the corner.