I want to know the answer to the following question:
Which government-sponsored entities had massive risky loan purchases?
All the background I'm provided with is that "Later, based upon information in the SEC's December 2011 securities fraud case against 6 ex-executives of Fannie and Freddie, Peter Wallison and Edward Pinto estimated that, in 2008, Fannie and Freddie held 13 million substandard loans totaling over $2 trillion.". Is that enough to answer the question?