A couple of quotes I happened to stumble across:
The attitude of the General Council in regard to the “Religious Idea” is clearly shown by the following incident: — One of the Swiss branches of the Alliance, founded by Michael Bakunin, and calling itself Section des athées Socialistes, requested its admission to the International from the General Council, but got the reply: “Already in the case of the Young Men’s Christian Association the Council has declared that it recognizes no theological sections” (Mr. George Howell’s History of the International Working-Men’s Association).
Which is interesting a) because I never realized the YMCA tried to join the First International (presumably we can now claim the Village People song as a communist anthem) and b) because the First International rejected a group for being explicitly atheist, which sheds some interesting light on debates about whether Marx was a secularist. Also:
We have no compassion and we ask no compassion from you. When our turn comes, we shall not make excuses for the terror. But the royal terrorists, the terrorists by the grace of God and the law, are in practice brutal, disdainful, and mean, in theory cowardly, secretive, and deceitful, and in both respects disreputable (“Suppression of the Neue Rheinische Zeitung”).
Which is presumably the source of Negri’s celebrated line “No pity for our enemies.”