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The US authorities will be interested in talking with them for breaking SEC laws for soliciting money from US investors during the ICO for ICN tokens that are unregistered securities since they're shares in Iconomi that receive dividends.
http://i.imgur.com/Aw4em1W.jpgALL US citizens if those USD really were from US... can got FULL REFUND if they feel scammed now.
Oh... maybe not becouse price is 3x ICO what a BS statements.
ICONOMI was not operating in US to obey US law your responsibility is where you put your money.