This 2005 post from the NSA’s internal newsletter SIDToday describes the agency’s ongoing surveillance of a, “outwardly legitimate” European activist group, the Anti-Imperialist Camp: see the Intercept article NSA Used Porn to “Break Down Detainees” in Iraq — and Other Revelations From 297 Snowden Documents, 1 March 2018.
These classified annexes to the Obama administration’s Cyberspace Policy Review were not published with the rest of the report in May 2009 and acknowledge that cyber defence initiatives have civil liberties implications: see the New York Times article Hunting for Hackers, N.S.A. Secretly Expands Internet Spying at U.S. Border, 4 June 2015.
This briefing from 23 June 2010 describes the NSA’s plans for the G8 and G20 summits in Toronto and the extent of Canadian cooperation. Note that redactions have been made to this document that were not present in a version broadcast on television: see the CBC News article New Snowden docs show U.S. spied during G20 in Toronto, 28 November 2013.