Mo. Const. art. X, § 6(b). Intangible property exempt from taxation, when — local governments may be reimbursed, when

The general assembly may by general law exempt from taxation all intangible property, including taxation on the yield thereof, when owned by: (1) Individuals; or (2) Labor, agricultural or horticultural organizations; or (3) Corporations or associations organized and operated exclusively for religious, charitable, scientific or educational purposes, no part of the net income of which inures to the benefit of any private stockholder or individual; or (4) Hospitals which are exempt from payment of Missouri state income tax. [Effective - 07 Dec 1972 , see footnote]