What do you mean "becomes"? J. Edgar Hoover actually did use his power to persecute political dissidents. I say this whole FBI backdoor/legal intercept thing reeks of trying to do that sort of thing again.

I mean, it's pretty easy to monitor Quaker anti-war activists: they do everything publically and invite participation politely. No agency needs wiretap access to monitor them. So, who are they going to monitor with this?