Pershing Square Capital Management – reportedly the largest investor in Fannie Mae and Freddie Mac common shares – filed two separate lawsuits last week demanding the federal government cease and desist its “net worth sweep” of GSE profits. The New York hedge fund contends that the government’s action not only illegally shortchanges investors of the GSEs’ common, it also amounts to a de facto liquidation of the two firms, according to its first complaint filed with the U.S. Court of Claims in Washington. The first complaint lists the U.S. as a defendant, as well as Fannie and Freddie as nominal defendants.