Trust law
The trustee is given legal title to the trust property, but has an obligation to act for the good of the beneficiaries. The benefits of the trust belong to the beneficiary. The trustee may be compensated and have expenses reimbursed. But the trustee must otherwise turn over all profits from the trust properties. Trustees who don't do this are self-dealing. Courts can reverse self dealing actions, order profits returned, and impose other sanctions.