If elected he said he wanted to act as a go-between for the public, police and government.

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The dossier indicated that Mr. Tsarnaev offered to act as a financial go-between for an organization based in the U.S., the official said.

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For years an informal adviser to Beijing leaders, he is well placed to act as a go-between, though his ties to Lee Teng-hui have cooled partly due to differing political views.

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