Infowars is a website owned by Right Wing extremist Alex Jones. It's marketed as a news outlet, but a majority of what is covered involves various conspiracy theories. An Infowars reporter was present at a FBI press conference in Cambridge, Massachusetts recently and a war of words erupted.

The description of the video from the uploader,

So my pal, Roger Nicholson, lives right behind the terrorists apartment in Cambridge, Massachusetts, and he confronts this "reporter" from Alex Jones' Infowars who has interrupted FBI press conferences by yelling about the bombings being a false flag construed by the FBI and the government.

You can check out the video below.
WARNING: VIDEO CONTAINS HEAVY PROFANITY