To be guilty of the offense, a person must know that the property had been stolen, but he need not know that it was moving as, or constituted a part of, interstate commerce. The term "interstate commerce" merely refers to the movement of property from one U.S. state into another; and it is sufficient if the property has recently moved interstate as a result of a transaction or a series of related transactions that have not been fully completed or consummated at the time of the person's acts as alleged.