You can read the letter at the link. They are mostly people you have never heard of.
http://www.nytimes.com/interactive/2016/08/08/us/politics/national-security-letter-trump.html
The 29 CFR members who signed the statement:
Bellinger, John
Blackwill, Robert
Cohen, Eliot
Falkenrath, Richard
Fontaine, Richard
Frazer, Jendayi
Friedberg, Aaron
Green, Michael
Gunderson, Bryan
Hayden, Michael
Hills, Carla
Inboden, William
Jeffery, Reuben
Jeffrey, James
Kassinger, Theodore
Long, Mary Beth
Negroponte, John
OSullivan, Meghan
Price, Daniel
Rostow, Nicholas
Schake, Kori
Silverberg, Kristen
Tahir-Kheli, Shirin
Taft, William
Wainstein, Kenneth
Waxman, Matthew
Zakheim, Dov
Zelikow, Philip
Zoellick, Robert
Are all these “formers” from the Bushies admin? Michael Chertoff is for sure.