Query: Which blogger calling for demonstrations was arrested for tax evasion?
Context: Prior to the rally, seven anti-China protestors were arrested in Hanoi after unfurling a banner and shouting "Boycott the Beijing Olympics" through a loudhailer at a market. A Vietnamese American was deported for planning protests against the torch, while a prominent blogger, Điếu Cày (real name Nguyễn Văn Hải), who blogged about protests around the world and who called for demonstrations in Vietnam, was arrested on charges of tax evasion. Outside Vietnam, there were protests by overseas Vietnamese in Paris, San Francisco and Canberra.