Fortunately in Australia the corporations act has protections...

Fortunately in Australia the corporations act has protections for minority shareholders.
Directors need to act in good faith for all shareholders and must avoid conflicts of interest.
If any of the past directors were not acting in the best interest of all shareholders, there are grounds for legal action.
Directors have disclosure obligations- and must give us details of the concerns raised related to the potential hostile shareholder.

Blood is in the water and the sharks are circling. Interesting times for this profitable high growth business.