Where a vendee fraudulently conceals the fact that she purchased through a broker employed by the vendor, and represents that a third person was the procuring cause of the sale, whereby the vendor is induced to pay the commission to such third person, the broker can not sue the purchaser for the lost commission, as the vendor's liability to him remains unaffected by such payment to the third person. Cohen v. Hirschfield, 16 Daly (N. Y.), 96, 9 N. Y. S. 512. A broker may be deprived of his right to commissions by the fraudulent conduct or misrepresentations of third persons in privity with him. Thwing v. Clifford, 136 Mass. 482.