N.Y.C. Charter § 819: Section 819. No compensation to unauthorized employee.

No officer of the city whose duty is to sign or countersign warrants shall draw, sign or issue, or authorize the drawing, signing or issuing of any warrant on the commissioner of finance or other disbursing officer of the city for payment of salary to any person in its service whose appointment or retention has not been in accordance with the civil service law and the valid rules in force thereunder.