I initiated communications between a buyer seller and shipper , but was circumvented. These companies are now conducting business. I have received no

This would depend on what your contract with the parties said.  If no contract, no rights.   Michael A. Caldwell 404-979-3150

Generally speaking, finders are not entitled to recover compensation in the absence of an express agreement providing for such compensation. In some states, the agreement must be reduced to writing to be enforceable. If you need assistance in enforcement of your finder's fee, you should engage the services of an attorney.