49 C.F.R. § 371.2
Unless specifically defined elsewhere, in this part:
Broker means a person who, for compensation, arranges, or offers to arrange, the transportation of property by an authorized motor carrier. Motor carriers, or persons who are employees or bona fide agents of carriers, are not brokers within the meaning of this section when they arrange or offer to arrange the transportation of shipments which they are authorized to transport and which they have accepted and legally bound themselves to transport.
Bona fide agents are persons who are part of the normal organization of a motor carrier and perform duties under the carrier's directions pursuant to a preexisting agreement which provides for a continuing relationship, precluding the exercise of discretion on the part of the agent in allocating traffic between the carrier and others.
Brokerage or brokerage service is the arranging of transportation or the physical movement of a motor vehicle or of property. It can be performed on behalf of a motor carrier, consignor, or consignee.
Non-brokerage service is all other service performed by a broker on behalf of a motor carrier, consignor, or consignee.
49 C.F.R. §371.2