Freddie Mac’s top regulator sent GSE officials a letter that apparently affirmed the company was safe and sound just before the enterprise ousted three top executives due to accounting failures. Attorneys for one of the former Freddie officials submitted that letter, dated June 4, during a hearing in federal court last week. Leland Brendsel, who stepped down as Freddie’s chief executive June 7, and Vaughan Clarke, the GSE’s former chief financial officer, are contesting