Both borrowers and lenders have been bilked out of hundreds of millions of dollars by Fannie Mae and Freddie Mac due to excessive fees that the government-sponsored enterprises have charged to guarantee mortgage-backed securities, according to court papers filed late last month. Lawyers in at least two states are seeking class-action status for civil cases filed against the two large GSEs. According to one complaint, Fannie and Freddie have violated antitrust statutes by colluding to…