The folks over at ProPublica have compiled an
extraordinary package of stories and
graphs, from past and present, that explain the NSA’s surveillance program as
well as other wiretapping efforts used by law enforcement agencies in the U.S.
They have also created a timeline of U.S. spying techniques dating back to the 1978 Church hearings, which led
to the creation of the FISA court.
extraordinary package of stories and
graphs, from past and present, that explain the NSA’s surveillance program as
well as other wiretapping efforts used by law enforcement agencies in the U.S.
They have also created a timeline of U.S. spying techniques dating back to the 1978 Church hearings, which led
to the creation of the FISA court.

One of the source links in the post expired, and here is the one that works https://www.lvcriminaldefense.com/no-warrant-no-problem-how-the-government-can-still-get-your-digital-data/