"The Hungarian government has desecrated and distorted our work and suppressed civil society for political gain, using tactics that are unprecedented in the history of the European Union", said Patrick Gaspard, President of the foundations "Open Society".
OSF said the move follows steps by Orban to "impose further restrictions" on non-governmental organizations. "It has become impossible to protect the security of our operations and our staff in Hungary from arbitrary government interference".
As well as bemoaning "burdensome" transparency requirements on funding from overseas, the group registered its particular anger over measures in the package invoking national security interests, such as rules which would require NGOs working with asylum seekers to be licensed by the government. The law was termed the "Stop Soros" bill.
The dispute between billionaire philanthropist George Soros and Prime Minister Viktor Orban escalated Tuesday when Soros announced that he was closing his Open Society Foundations offices in Hungary and moving them to Berlin.
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He and his supporters had pressured the country's long-term leader, Serzh Sargsyan, to step down rather than seek a power grab. After the "velvet revolution" victory, Pashinyan did not make such harsh criticisms of the Eurasian Economic Union.
The theme of thwarting Soros's alleged efforts to encourage immigration dominated the election campaign during which Orban said some 2,000 "mercenaries" paid by Soros were working in Hungary.
The campaign was criticized in the Hungarian Jewish community as having anti-Semitic overtones.
Earlier against Soros and his Foundation in Hungary was launched large-scale campaign.
The OSF is active in 100 countries and for more than 25 years it has channelled more than €27bn in the promotion of human rights and democracy in Eastern Europe. Zovacs studied at the Central European University, a school Soros helped fund.