say (something) against (someone or something)
To make some verbal complaint or criticism regarding someone or something. I'm not saying anything against the quality of your work, it's just that it doesn't really follow the directions we gave you. He's so averse to conflict that he simply refuses to say anything against any of his coworkers.
say something against someone or something
to speak out against someone or something; to make a case against someone or something. I would never say anything against you! No one would say anything against your work.