The department of human services shall have supervision and management of:
(1) All forms of public assistance under the control of the state;
(2) Old-age assistance;
(3) Aid to dependent children;
(4) Aid to persons who are blind;
(5) Unemployment relief; and
(6) Aid to families of persons committed to state institutions within the department.
The department shall also have supervision over the placement of children in private homes or institutions.