Blind trust
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A blind trust is a trust in which the fiduciaries, namely the trustees or those who have been given power of attorney, have full discretion over the assets, and the trust beneficiaries have no knowledge of the holdings of the trust and no right to intervene in their handling. Blind trusts are generally used when a settlor (sometimes called a trustor or donor) wishes to keep the beneficiary unaware of the specific assets in the trust, such as to avoid conflict of interest between the beneficiary and the investments. Politicians or others in sensitive positions often place their personal assets (including investment income) into blind trusts, to avoid public scrutiny and accusations of conflicts of interest when they direct government funds to the private sector.
http://en.wikipedia.org/wiki/Blind_trust