Anonymous" - it’s one of the world’s most well known, lethal and high profile hacking group ever formed by the power of freedom of speech. Not only they defined "hacktivism", they defend the belief of freedom and giving the power back to the people. Twitter suspended Anonymous twitter account due to violation of TOS against their recent vigilante movements on Westboro Church. These guys are capable of event launching massive strikes and protest across the globe - such example is on Scientology Churches across the globe where hundreds and thousands of people who does not know each other turned up and standing firm on a common ground and belief. Anonymous was known to take down federal government servers, Paypal, Visa, Mastercard, Sony Corporations and other high profile take downs and cyber attacks.