Anonymous is a decentralized global hacktivist movement that is widely known for cyber-attacks against governments, government agencies, corporations, and any organization they consider embodying hypocrisy. They strongly support anti-surveillance and anti-censorship views.
Anonymous Malaysia, a cell of Anonymous, recently took the global hacktivist spotlight by demanding more powerful cyber-security safeguards within Malaysian government institutions responsible for the security of personal data related to Malaysian citizens. Earlier this year the Malaysian government identified and took into custody persons they considered to be members of the hacktivist leadership.
So Anonymous Malaysia is not so anonymous now but still dangerous. Being a collective, Anonymous Malaysia is much more than the people detained and other cells are willing to support the local cell. That means more attacks may still be on the way.