The California Public Employees' Retirement System threatened Monday to sell its investments in three European companies [ABB, Alcatel, Siemens] if they didn't sever relations with the government of Sudan, which human rights groups and some governments have accused of complicity in mass killings in the Darfur region... In addition, two big oil companies in which CalPERS owns stock, Royal Dutch Shell and France's Total, were put on notice that they would be scrutinized further, even though a preliminary CalPERS investigation found that their Sudanese subsidiaries do no business with the government of [Sudan].