503 U.S. 594 503 U.S. 594 112 S.Ct. 1619 118 L.Ed.2d 243 Keyton E. BARKER and Pauline Barker, et al., Petitionersv.KANSAS et al. No. 91-611. Argued March 3, 1992. Decided April 21, 1992. Syllabus Title 4 U.S.C. § 111 authorizes the States to tax federal employees’ compensation if the taxation does not discriminate against the […]