Including members of Congress.
Whistleblower William Binney, one of the first to reveal the NSA's massive domestic spying program, and former crypto-mathematician who served in the agency for decades, discusses the FBI's role in tracking citizens via email and other means. Once you are under investigation, the FBI and NSA can go back thru 10 years of your private email data.
Here's a related story involving Verizon.
WASHINGTON (CBS DC) – Verizon has filed a patent for targeting ads that collect information from infrared cameras and microphones that can detect the amount of people and types of conversations happening in customers’ living rooms.
“If detection facility detects one or more words spoken by a user (e.g., while talking to another user within the same room or on the telephone), advertising facility may utilize the one or more words spoken by the user to search for and/or select an advertisement associated with the one or more words,” Verizon states in the patent application.