William Ackman of Pershing Square Capital Management LLC has filed a case against the U.S. Government accusing them of taking away all the profits of Federal National Mortgage Assctn Fnni Me (OTCBB:FNMA) and Federal Home Loan Mortgage Corp (OTCBB:FMCC) illegally. Pershing has filed this case in the U.S. Court of Federal Claims (Washington, D.C.) and…