An anti-capitalist protester dressed as a clown gestures in front of a policeman near the ECB building before the official opening of its new headquarters in Frankfurt

An anti-capitalist protester dressed as a clown gestures in front of a policeman near the European Central Bank (ECB) building before the official opening of its new headquarters in Frankfurt March 18, 2015. Thousands of anti-capitalist protesters clashed with riot police near the new headquarters of the ECB in Frankfurt on Wednesday, hours before the ceremonial opening of the 1.3-billion-euro ($1.4-billion) building. REUTERS/Kai Pfaffenbach (GERMANY – Tags: BUSINESS CIVIL UNREST)