The United States Supreme Court has held that state residency requirements for eligibility under federal welfare assistance programs are unconstitutional because they restrict the right to travel.
Shapiro v. Thompson, 89 S. Ct. 1322 (1969).
Patrick J. Kearney,
Constitutional Law - Right to Travel,
Duq. L. Rev.
Available at: https://dsc.duq.edu/dlr/vol8/iss1/16