From Roubini Global Economics:

Pressure on China to Divest from Sudan

• In early 2010, TIAA-Cref, which manages funds for many U.S. pensions, sold its stake in PetroChina, several other Chinese oil companies, and the Indian National Oil company that operate in Sudan. TIAA-Cref had tried to convince the companies to cut their ties with the country, arguing that the agreements prop up the Sudanese government, which has contributed to human rights violations.