Alexis Tsipras, the leader of Greece's leftist Syriza party: In his latest proposal, Tsipras argues the Greek government should refuse to talk to the so-called troika comprised of the European Commission, the European Central Bank and the International Monetary Fund. He wants to "criminalize" the privatization of public enterprises. He has been labelled the "most dangerous man in Europe" since he became leader of the radical left and has been pressuring successive governments to abandon austerity measures that underpin Greece's continued access to international aid. What's his goal? Tsipras is banking on the fact that the euro treaties don't permit a country to be evicted from the euro zone -- so he has opted for uncompromising opposition.