Grass-eater

But why do police become grass-eaters at all, if they lack the greed and contempt fo decency necessary to become meat-eaters?

Source: wiktionary

It was the grass-eaters, the commission found, that made corruption respectable within the organization, encouraging a code of silence among officers.

Source: wiktionary

Grass-eaters constituted the majority of police officers who were corrupt; meat-eaters were rare. But meat-eaters are more dangerous. They aggressively misuse their police powers for personal gain.

Source: wiktionary

That is what the modern men of Japan have done, these grass-eaters.

Source: wiktionary