Example 1. A, who is engaged in the business of accepting horse race bets, employs ten persons to receive on his behalf wagers which are transmitted by telephone. A also employs a secretary and a bookkeeper. A and each of the ten persons who receives wagers by telephone on behalf of A are liable for the special tax. The secretary and bookkeeper are not liable for the special tax unless they also receive wagers for A.
Example 2. B operates a numbers game and has an arrangement with ten persons, who are employed in various capacities, such as bootblacks, elevator operators, news dealers, etc., to receive wagers from the public on his behalf. B also employs C to collect from the ten persons referred to, the wagers received by them on B's behalf and to deliver such wagers to B. C performs no other services for B. B and the ten persons who receive wagers on his behalf are liable for the special tax. C is not liable for the special tax since he is not engaged in receiving wagers for B.
26 C.F.R. §44.4411-1