An inter-galaxy corporation which controls a vast proportion of the Imperial economy in Frank Herbert's Dune Cycle.

All the Great Houses own shares in CHOAM.

The Combine Honnete Ober Advancer Mercantiles. Difficult to define beyond this - an economic organization run (minority) by the Emperor and (majority) the Landsraad, dictating the particulars of interstellar and interplanetary trade with the Spacing Guild.

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