To them, Tsipras is dangerous because he has pledged to tear up his country's controversial bailout pact with Brussels, despite saying he wants the country to stay within the euro.
Faced with an opportunity last December to wring concessions out of Brussels in return for supporting the euro-zone Fiscal Pact, he opted to make highly technical, apparently innocuous but actually implausible demands relating to the City of London, including a veto over single market financial rules.