HELP!

I am stuck in a difficult moral dilemma now. (My BGS module doesn't give a clue as to HOW to solve the problem. It only serves to make us discuss it on the tabletops, only to sweep it under the carpet again...)

I've just been told that my neighbour's maid is being abused (to a lesser degree) in numerous ways- such as being denied of sufficient food and medicine. Not just that, there is no respect for her and she gets verbally abused everyday, when the maid is just at a tender age of 18 years old. Shes even younger than I am. I cant imagine how someone is able to treat a young girl so cruelly and not feel any tinge of guilt. A little patience isn't too much to ask for, is it? A kinder tongue doesn't come cheap, is it? Do you take pleasure in monitoring all the activities of your maid, only to pounce unto to her, triumphantly claiming that you saw her committing a mistake, which warrant your scoldings?

On top of that, she'll lash out at my maid too, when she hasn't done much wrong, except to talk to her at a few instances. If wasn't as if my maid made her maid slack off. The employer ticked off the both maids and then bad-mouthed about my maid to hers, warning her to stay away.

I think theres something twisted with such behaviour. People with Psychology knowledge, please enlighten me. Does she think that what she's doing now is nothing wrong? Un/Intentionally Amoral? Un/Intentionally immoral? Or does she enjoy being a bitch? What's going through her mind?

Besides that, the more important question is this? What should I do now? If i stay silent about this, I'll continue to witness all the unnecessary suffering all her maids go through. (She changes them frequently, except for a few hardy ones.) If i dont, my neighbour would surely know who spilled the beans... Then, we'll create discord & expect a raging backlash from her. In fact, im sure most of the immediate neighbours are aware of this. Shes even more annoying than drilling at 2am in the morning. So what should I do? Is there any way I am able to sound the alert to some sort of relevant authorities while staying anonymous? Is the ministry of manpower in charge of this?