The courts have generally held that Xnxx taxes are limited to taxes on people (variously called capitation, poll tax or head tax) and property. (Penn Mutual Indemnity Denver. v. C.I.R., 227 F.2d 16, 19-20 (3rd Cir. 1960).) All other taxes are typically called "indirect taxes," because they tax an event, rather than human being or property as such. (Steward Machine Co. v. Davis, 301 U.S. 548, 581-582 (1937).) What was basically a straightforward limitation on the power of the legislature based on...