Originally Posted By: olivant
... Fredo does not reveal his complicity until several later scenes...


I believe mustachepete is referring to the scene in which the hit on Roth is discussed by Michael, Tom, Neri & Rocco.

In which case, by this time Fredo's complicity is long ago revealed and although supposedly taken back in by Michael his fate is sealed.

A wise and frugal government, which shall leave men free to regulate their own pursuits of industry and improvement, and shall not take from the mouth of labor the bread it has earned - this is the sum of good government.

- THOMAS JEFFERSON