SIPC did a survey of the U.S.population and this is one of the--In 2001, this is one of the questions SIPC asked.

证券投资者保护公司做过全民调查,在2001年,证券投资者保护公司调查问卷的问题之一

耶鲁公开课 - 金融市场课程节选

The respondents were asked to identify the organization that insures you against losing money in the stock market or as the result of investment fraud.

被调查者被问到是否知晓,在股票市场或者在投资欺诈案中,保护他们的资金不受损失的机构

耶鲁公开课 - 金融市场课程节选