I don't know about should you be fined, but anecdotally, I believe you will be responsible. At least that's what I see in our RWA (Indian for HOA) in Bangalore: if we hire a contractor, we have to make sure all the right stuff is mentioned in the contract about labourer safety. I never cross-checked this, and I don't know the law in this case, but it seems to be a thing. And IMHO, it's a good thing if the law requires it.