I wonder if this is a reference to the legalists. Mozi wanted people to act only in ways that benefit everyone, and his method for this was to construct a system of laws that rewarded people for doing things that helped the world and punishing them for harming it. (Seems like a no-brainer.) This idea was developed by later thinkers often referred to as "Legalists." They had no interest in Mozi's goal of universal welfare but used his method of crafting laws to fortify the state. Unlike the Confucian traditionalists, therefore, they innovated 'their own classics, plans, rights, and measures.'