Sanford Weill built Citigroup into a mega bank through repeated acquisitions. He was the strongest voice for the repeal of the Depression era Glass Steagall Act banning banks from risk taking activities in investment banking. The Glass Steagall Act was repealed in 1999, and repeal legislation was given the name of "Citigroup Authorization Act." On July 23, 2012, Weill told CNBC: "I am suggesting that they (the big banks) be broken up so that the taxpayer will never be at risk, the depositors won't be at risk... Mistakes were made." Weill said that the housing bubble and the financial crisis has proved that the repeal was a mistake.