From Lexicanum

Followers of Chaos Undivided venerate Chaos itself, seeing the Chaos Gods as a pantheon to be worshiped equally. Of all Chaos worshipers they follow Chaos in its purest form. Champions of the creed are given a Mark of Chaos Undivided.

Followers of Chaos Undivided

• Alpha Legion
• Black Legion
• Iron Warriors
• Night Lords
• Word Bearers
• Furies (daemons)

Sources

• Codex: Space Marines (3rd Edition, 1st Codex)
• Codex: Space Marines (3rd Edition, 2nd Codex)

Related Articles

• Mark of Khorne
• Mark of Slaanesh
• Mark of Tzeentch
• Mark of Nurgle