Environmentalist Bill McKibben took to the pages of the New York Times earlier this month to complain about being followed by conservative activists with cameras, calling himself "under surveillance."

In his op-ed, McKibben compared being filmed by conservative activists to the swiftboating of John Kerry during the 2004 election.

"To be watched so much is a kind of never-ending nightmare. And sometimes it's just infuriating. I skipped the funeral this summer of Patrick Sorrento, an important mentor to me at my college newspaper, because I didn't want my minder to follow me and cause a distracting spectacle," McKibben wrote.

"When my daughter reports someone taking pictures of her at the airport, it drives me nuts. I have no idea if it's actually this outfit; common decency would suggest otherwise, but that seems an increasingly rare commodity."

What he failed to mention is that his environmental group, 350.org, has been on the forefront of doing the same thing to politicians.

Activists from 350 Action, the political wing of 350.org, have been "bird dogging" candidates throughout the 2016 election cycle. "Bird dogging" is what the group calls asking candidates surprise policy questions on the rope lines at events and filming the answers to post online later.

The group has posted a list of its 14 best "bird-dogging" successes on its website and has produced a video on how to confront candidates with questions. An affiliated group has a how-to guide for "bird-dogging" that includes step-by-step instructions on how to confront candidates for online videos.

"Since the summer, 350 Action has been injecting climate into the election cycle. From Iowa to New Hampshire, we've been pushing the Democrats to embrace policies that will #keepitintheground and showing how much the Republican candidates are bought out by the fossil fuel industry," the group states on its website.

The filming of politicians by 350 Action isn't only limited to the rope lines at rallies and speeches.

At a 5K run in New Hampshire on Thursday, activists from 350 Action ran directly behind Sen. Kelly Ayotte, a Republican facing a tough re-election battle, wearing Donald Trump masks. The video was titled "Kelly Ayotte Can't Run From Her Trump Problem" and at least six activists ran next to and behind the Republican senator with the masks for a video that was posted online later that day.

The description of the video posted on the group's YouTube page said, "350 Action made clear that Kelly Ayotte can't support a climate denying racist while pretending to be a 'green' candidate."