Here’s a hypothetical:
Large Retailer ACME has a business selling various widgets. Small Upstart Retailer BAKER opens a shop in town, and also wishes to sell widgets.
ACME gets its goods wholesale from X-CO, YA-YA inc., and Z-etc. BAKER approaches these same wholesalers.
Now, ACME, long the sole supplier of XYZ goods to the local town, is annoyed at the new competition. ACME calls X,Y, and Z and says, “If you sell your stuff to BAKER, you can kiss my account goodbye.” ACME is a large business, and loss of its outlet for XYZ goods would be hard on X, Y, and Z–much worse than if they refused to do business with BAKER.
Is it legal for ACME to do this?