Here's an interesting but valuable Infographic that takes us back from the very beginning showing the loss of American's private communications rights in the name of security. When you read through you'll see a familiar thread that it seems there was always a loophole allowing the government to take full advantage of to continue gathering information. A lot of times the government acted illegally and when caught communicated they would work to curb abuses.

Wiretapping: Privacy vs. security
Compiled By: Who Called My Phone