Before you go and do anything Embo have you considered what will be involved ?
Costs: dogs are expensive to maintain, and if they are injured or ill they will need treatment which is expensive, Do you have the funds for medical care for the dogs? Some dogs may need on going care, treatment or operations. The dogs will also have to be vaccinated, microchipped, desexed and wormed, plus feed and water and if the dogs are underweight they will need special nutrients to get them healthy again. Why not go to a rescue organisation and adopt a dog that has come from this type of environment and give it a second chance?
The Law: trespassing is against the law, you can't just go to someone's property and steal there dogs, even if the dogs are not treated well. If you got caught it will do nobody any good, all it will do is get you in jail and fined, give animal activists a bad name ( which we don't need ) and it will not help the dogs in anyway. How are you suppose to help animals if you are behind bars and have a criminal record against your name?
I understand that you are very passionate about this cause, as am I but there are better ways to help animals out. You can adopt a dog from a rescue organisation like I said above, join a rescue organisation that is dedicated to banning puppy farming eg. Oscars Law. Or donate to a organisation

Renbury Farm in Sydney always has dogs coming in that need a home that have been used as breeding dogs.