If the federal government deploys its full weight against you, there's really not much you can do. Directed against one individual, then sure, an active MITM at

If the federal government deploys its full weight against you, there's really not much you can do. Directed against one individual, then sure, an active MITM attack is feasible if you don't have cert pinning. I doubt it is cost effective though when compared to just filing a national security letter with the companies you're communicating with or putting malware on your box or installing a keylogger or just plain locking you in a room and beating you with a rubber hose until you tell them what they want to hear.