
April 2007
Estonia removes a Soviet war memorial from its capital, provoking a series of cyberhits -- mostly DDoS attacks -- originating on Russian servers. Details about who is responsible for the attacks, which disable various Estonian government websites and substantially disrupt commerce for several hours, remain murky, but the pro-Kremlin youth group Nashi eventually claims responsibility, though it denies having carried out direct orders from the Russian government. Whether state-sponsored or an especially virulent example of nationalist hacktivism, the cyberassault against Estonia amounts to one of the largest DDoS attacks in history.
January 2008
Anonymous releases a YouTube video announcing Project Chanology, a deliberate campaign to destroy the Church of Scientology due to its "campaigns of misinformation" and "suppression of dissent." "We are Anonymous. We are legion. We do not forgive. We do not forget. Expect us," the group declares in an ominous, automated voice. Less than a month later, Anons hold their first physical protest (also against Scientology) simultaneously at various locations around the world, with many demonstrators wearing the signature Guy Fawkes masks that will later become iconic symbols of the movement.
November 2010
Tunisian dictator Zine el-Abidine Ben Ali blocks access to WikiLeaked U.S. State Department cables noting massive corruption in his government. In response, Anonymous hackers launch "#OpTunisia," attacking Tunisian government websites and at one point bringing down the Tunisian stock exchange. As protests rage across the region in the following months, the group launches a series of "Freedom Ops" to assist pro-democracy activists -- Anonymous's biggest foray yet into world politics.
December 2010
Anonymous launches Operation Avenge Assange after MasterCard and Visa block payments to the whistle-blowing website WikiLeaks. Anons knock out the websites of the credit card giants and briefly slow web traffic to PayPal using an application called Low Orbit Ion Cannon, which directs massive amounts of traffic to specified websites.
December 2011
AntiSec, an offshoot of Anonymous that takes particular issue with the cybersecurity industry, hacks the Texas-based private intelligence firm Stratfor, knocking its website offline and lifting 200GB of data, mostly emails, which it hands over to WikiLeaks. It is the largest public "d0xing" -- the posting of private information online -- attack that Anonymous has carried out to date.
January 2012
A group of pro-Palestinian hacktivists calling themselves "Nightmare" knocks out the websites of the Tel Aviv Stock Exchange and El Al airlines. In an online post taking credit for the attacks, the group says it is joining Saudi hacker 0xOmar, who previously released tens of thousands of Israelis' credit card numbers on the Internet, in a "movement" of "Islamic hackers against Israel." The next day, Israeli hackers going by the name IDF-Team retaliate by knocking the Saudi Stock Exchange and the Abu Dhabi Securities Exchange offline.
February 14, 2012
On the one-year anniversary of Bahraini armed forces' violent dispersal of rallies in the capital, Manama, during the Arab uprisings, Anons carry out a series of hacks against the Bahraini government and its backers, notably the Pennsylvania-based tear gas manufacturer Combined Systems. The kingdom is eventually moved, in February 2013, to ban the import of Guy Fawkes masks to its still-roiling territory.
February 29, 2012
Interpol arrests 25 suspected Anonymous hackers from around the world following an FBI sting operation that flipped an Anonymous ringleader, Hector Monsegur, known online as "Sabu." The information he provides leads to a wave of hacktivist arrests -- for taking part in everything from the Stratfor hack to illegal eavesdropping on an FBI conference call -- dealing Anonymous a major blow.
March 2012
Frustrated with the way WikiLeaks handled the Stratfor data dump -- it was an unqualified media flop -- Anonymous launches its own WikiLeaks clone: Par:Anoia (Potentially Alarming Research: Anonymous Intelligence Agency). The website relies on purloined "submissions" provided by the Anonymous community and publishes everything from hacked emails from the Syrian Foreign Ministry to New York City Police Department video footage of the 2011 eviction of Occupy protesters from Zuccotti Park.
April 2012
Anonymous turns its guns on China, knocking out a number of corporate and local government websites and tagging them with the message: "Dear Chinese government, you are not infallible, today websites are hacked, tomorrow it will be your vile regime that will fall."
October 2012
WikiLeaks puts millions of its documents behind a pay wall, prompting a vicious rebuke from the freedom-obsessed web underground. The main Anonymous Twitter account tweets @wikileaks: "die in a fire." The Anonymous-WikiLeaks breakup is complete.
January 2013
Computer whiz kid and Internet activist Aaron Swartz hangs himself in his New York City apartment after federal prosecutors indict him for hacking into JSTOR's digital library, presumably to free millions of academic articles from behind its pay wall. His death in many ways symbolizes the battered state of the hacktivist movement and the futility of its utopian vision -- after all, Swartz stole mostly obscure journal articles -- but hardly sounds its death knell. Within weeks of Swartz's death, sympathetic Anons hack into the website of the government agency responsible for the sentencing policies of federal courts, at one point turning its home page into a version of the computer game Asteroids.

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