HARTFORD, Conn. — Two Connecticut labor unions are asking a judge to step in and stop the pending privatization of state-run group homes and other services for people with developmental disabilities.

The unions, CSEA and SEIU 1199, on Thursday filed a request in Hartford Superior Court for a temporary injunction to halt Democratic Gov. Dannel P. Malloy’s planned layoffs of the homes’ unionized state employees.

The Department of Developmental Services announced in August plans to privatize 40 group homes and other services, while cutting 605 positions. The unions, which recently filed a labor complaint, say the state cannot lay off members and contract out their services without bargaining with labor leaders.

Kelly Donnelly, Malloy’s spokeswoman, says private agencies already serve the vast majority of clients. She calls the administration’s actions “lawful and proper.”