First off, the NSA records every phone call (land line or cell), email, text and other electronic communication of every person in the country, every day, 24 hours a day, and archives all of them. Trillions of communications, located in a couple of facilities that are millions of square feet of computers. If the NSA flags one as not being related to international crime or espionage, but identifies it as local or state crime, the NSA can turn the communication over to state and local authorities. No warrant for a wiretap required. You just got busted.
Google is involved with the US intelligence services. None of your Gmails' are safe from the government. Hell, they're not even safe with Google. Nor are your emails through your internet service provider.
If you need a truly private conversation, meet whoever it is you need to speak to in a dense forest or in a very noisy place, such as a train yard. And cover your mouth while you speak. You want to stay out of a line of sight from parabolic microphones, or keep the background level noise so high that your voice can't be heard.
You're not safe in your own home, as some appliances (TV's, microwaves) can be used to monitor you, even when they're turned off. Your cell phone can be turned on or off remotely by the authorities, and can be used to reverse-tap your conversations.
Welcome to the land of the free.