Slamming the tech firm for slashing its employee base while sitting on 'billion dollars cash,' the hackers threatened to release games it has stolen from Zynga's server.
The hacking collective said it would shut down both Zynga and Facebook on November 5, the Daily Mail reports.
The threat comes after Zynga unveiled a restructuring plan in the wake of its disappointing third quarter earnings report on October 24.
Zynga CEO Mark Pincus announced last week it would lay off five per cent of its workforce, of approximately 3,000, shutting down its office in Boston and slashing the staff at the company's Austin branch.
The website has created popular games such as FarmVille and Words With Friends for Facebook.
According to the paper, the gaming unit accounted for 14 per cent of Facebook's total revenue for the first six months of 2012.