Did Surratt and Slater know about Harney's Mission?

[SSlater]

Thanks SSlater.

If Atzerodt knew about Harney, I wonder if Atzerodt's involvement in other activities was greater than we give him credit for.
And if he got his info from Booth, that may mean that Booth was higher up on the information chain than we give him credit for. (So much for a well guarded secret)

Either way, Stanton was right.
"Damn the Rebels, This is their work!"

I believe that Booth told Atzerodt about the scheme out of frustration. Tidwell has told us that Booth was in a black mood. Thus, Booth let off steam at Atzerodt. Booth was probably upset by not having a role in the scheme.