"It is a collusion of human traffickers, Brussels bureaucrats and the organizations that work in Hungary financed by foreign money," Viktor Orban told public radio on Friday.

"Let's call a spade a spade: George Soros finances them."

Across former Communist states of east and central Europe, leaders with a hardline bent have turned their wrath in recent months against Soros, a Hungarian-American financier who funds liberal charities and non-governmental organizations worldwide through his Open Society Foundations (OSF).

The campaign against Soros in countries formerly dominated by Moscow appears to follow a template set by Russian President Vladimir Putin, whose own crackdown on foreign-funded charities drove Soros's foundation out of Russia two years ago.