I agree that governments don't do anything well except collect every last cent we have, and spend it foolishly.

On another note, they do some enforcement in other areas that they do not enforce in our field.

They have roadblocks set up for seat belt use.
They have roadblocks set up for alcohol use.
They park off to the side in forests and other hiding spots with radar to track down speedsters
They will pull you over if they notice your license tag is not current
And everything else I can't think of at this time.

So what do the labour departments do in order to crack down on illegal activities in the workplace?

You may not need a nanny, but there does not seem as sense of urgency for business to follow the laws put forth. There are laws, but what is being done to enforce them?