Use the adjective faceless to mean impersonal or anonymous. The corrupt owner of a factory sees his employees as faceless worker bees.
The enormous audience in a concert arena appears faceless to the rock band on stage. You also might think of the people who make the laws that affect you every day as nothing but faceless bureaucrats. When there's nothing distinct about a person or group, something that makes them stand out as a unique individual, they're faceless. It's also a good way to describe anything lacking character or interest, like a faceless row of identical suburban houses.