While we leave the question open for further development by the parties on remand, it would appear at first blush that the Authority is an instrumentality of each of the signatory parties" to the interstate compact, Pub.L. No. 89-774, Sec. 4, and thus a creature of the states and the District of Columbia, which acts under color of state law, 42 U.S.C. Sec. 1983 (Supp. IV 1980).8