The obvious disclaimer to any advice you'll receive on this topic is that almost nothing you can do to harm a large company will be lawful, so you should most likely not even try. That being said, this might give you some ideas: http://theanarchistlibrary.org/library/elizabeth-gurley-flyn...

In general, there's a large body of knowledge in terms of sabotage or monkeywrenching with traditional workers organisation movements, there's no reason they're no applicable to software engineering. Just search for the above words in your favourite search engine.