Commercial Solvents Corporation v Commission (1974) Cases 6/73 and 7/73 is an EU competition law case, concerning monopoly and abuse of a dominant position.
Commercial Solvents Corp (also Istituto Chemioterapico Italiano SpA was being sued) ceased selling aminobutanol to Zoja, which was used to make an anti-tuberculosis drug. CSC decided to start making the drug itself, and so stopped selling to Zoja.
The ECJ held that CSC was dominant and abused its position.