Sounds like it might be earwigs?

Thanks for the response cathyca...but I found out from a friend with the same worms in her bin that they are the larva of the black solder fly....I actually found out this type of worm is also used in a different type of vermicomposting.

yes, and they get huge! The ones in my bin frequently got over 1" long, which seems to be excessive seeing as the black soldier flies are usually about 1/4".

They should be harmless unless too many invade your bin, then thy will compete with the red worms for food. Also if you have an enclosed bin like a plastic tub they can create alote of excess liquid while eating thus causing your tub to become anerobic, not good for your worms.

Can you post a picture?
I'm curious because as far as I can see, BSFL don't have pinchers.