of the extent of the documents". Edward Snowden described the release in a Twitter message as the "biggest leak in the history of data journalism". The ICIJ also said that the leak was "likely to be one of the most explosive [leaks of inside information in history] in the nature of its revelations". "This is a unique opportunity to test the effectiveness of leaktivism", said Micah White, co-founder of Occupy, "... the Panama Papers are being dissected via an unprecedented collaboration between hundreds of highly credible international journalists who have been working secretly for a year. This is the global professionalization of leaktivism. The days of WikiLeaks amateurism are over." WikiLeaks spokesperson Kristinn Hrafnsson, an Icelandic investigative journalist who worked on Cablegate in 2010, said withholding some documents for a time does maximise the leak's impact, but called for full online publication of the Panama Papers eventually. A tweet from WikiLeaks criticized the decision of the ICIJ to not release everything for ethical reasons: "If you censor more than 99% of the documents you are engaged in 1% journalism by definition." The whistleblower reported that the murder of journalists Daphne Caruana Galizia in 2017 and the Ján Kuciak in 2018 due to their investigations of the Panama Papers had deeply affected him and called upon the European Union to deliver justice. People named While offshore business entities are not illegal in the jurisdictions where they are registered, and often not illegal at all, reporters found that some Mossack Fonseca shell corporations seem to have been used for illegal purposes including fraud, kleptocracy, tax evasion and evading international sanctions. Reports from April 3 note the law firm's many connections to high-ranking political figures and their relatives, as well as celebrities and business figures. Among other things, the leaked documents illustrate how wealthy individuals, including public officials, can keep personal financial information private. Initial reports identified five then-heads of state or government leaders from Argentina, Iceland, Saudi Arabia, Ukraine, and the United Arab Emirates as well as government officials, close relatives, and close associates of various heads of government of more than forty other countries. Names of then-current national leaders in the documents include President Khalifa bin Zayed Al Nahyan of the United Arab Emirates, Petro Poroshenko of Ukraine, King Salman of Saudi Arabia, and the Prime Minister of Iceland, Sigmundur Davíð Gunnlaugsson. Former heads of state mentioned in the papers include: