prosecution staff and the attorney general and the deputy attorney general and the president has ordered the fbi to seal off those offices. >> as tipping points go, the saturday night massacre was a biggie setting in motion a series of events that tald take down the nixon presidency. it occurred on october 20, 1973 but less than a month before that date something else happened that didn't get saturday night massacre level attention but it was arguably just as important. on september 24, 1973, the office of legal counsel, the olc, part of the department of justice issued a memo that concluded "criminal proceed against against a president in office should not go beyond a point where they could result in so serious a physical interference with the president's performance of his official duties that it would