Conspiracy theories from alt-right news sources like Infowars and Breitbart have become commonplace at this point in the election. But now Bill O'Reilly is piling on. 

While Fox News hosts' have long accused the "mainstream media " of favoring Democrats, including 2016 Democratic presidential nominee Hillary Clinton, the "O'Reilly Factor" host took things a step further this week. On Monday, O'Reilly alleged that multiple major news outlets are actively working against GOP nominee Donald Trump, going as far as to threaten employees who do not comply with the anti-Trump editorial agenda. 

"It’s a complicated situation, but I think everyone can agree — except for the media organizations that now have ordered their employees to destroy Trump — there’s at least three of them," said O'Reilly. "I can’t say who they are right now because I don’t have it nailed down, but I am 100 percent convinced, and these media organizations have actually put out, ‘If you support Trump, your career is done done here.’ News organizations have sent, not officially, but through the corporate grapevine that we don’t want anybody supporting Trump. If you study it, you can see which ones they are."

There is no evidence to support O'Reilly's claims and a coordinated effort from major media organizations like this would be unethical and is unlikely. But we studied it to see if we could "nail down" which media organizations O'Reilly might suspect. 

Here are a few news outlets that have been accused of favoring Clinton:

The Washington Post

The Washington Post has broken some of the most harmful stories to the Trump campaign this election cycle, including, most recently, the leaked audio of Trump's lewd comments about women and sexual assault to NBC's Billy Bush. Trump has been consistently critical of the paper's coverage of his campaign, often tweeting disparaging remarks about the paper's journalists. 

In June, Trump banned the Washington Post from covering his campaign events after the paper published a story about Trump's comments suggesting that Barack Obama was possibly complicit in the shooting at Pulse night club in Orlando, Florida, in which 49 people were killed in the worst mass shooting in U.S. history. 

The New York Times

The New York Times has also broken some of the more critical Trump stories, including the revelation that Trump lost almost a billion dollars in 1995 and could used the losses to avoid paying taxes for nearly two decades. The paper is another Trump targets frequently on Twitter. 

The New York Times editorial board published a searing editorial titled, "Why Donald Trump Must Not Be President," declaring the GOP nominee unfit for the office. While the New York Times' news operations and editorial board operate independently from each other, Trump accused the paper of bias. And Dean Baquet, the top editor at the New York Times, has said that he would go to jail in order to publish Trump's unreleased tax returns. 

The New York Times has also been critical of Clinton in their coverage. The paper has written extensively about the conflicts of interest posed by the Clinton Foundation and its donors' potential special access to the Clinton-run State Department.

The Huffington Post

Digital media giant The Huffington Post has made no secret that it does not support Trump's presidential bid. The outlet has attacked an editorial disclaimer to every article covering the GOP nominee declaring the candidate a racist and a misogynist. 

"Editor’s note: Donald Trump regularly incites political violence and is a serial liar,rampant xenophobe, racist, misogynist and birther who has repeatedly pledged to ban all Muslims — 1.6 billion members of an entire religion — from entering the U.S.," reads the add-on. 

Does this equate to unfair coverage of Trump? He seems to think so. 

The Huffington Post has also spent some time banned from Trump campaign events, along with the National Review, The Daily Beast, Buzzfeed and Politico. 

CNN

CNN is considered the objective voice in cable news, between the left-leaning MSNBC and the right-leaning Fox News, but that has not stopped Trump from calling foul on the network's coverage of his campaign. Trump has attacked CNN for bias, for supposed bad ratings and for even actively working for Clinton — he has often dubbed the network the "Clinton News Network" and recently accused CNN of giving Clinton the second debate questions ahead of time. 

USA Today

USA Today has never endorsed a candidate for president, but the paper's editorial board did pen an essay declaring Trump unfit for the White House. 

"Stay true to your convictions. That might mean a vote for Clinton, the most plausible alternative to keep Trump out of the White House. Or it might mean a third-party candidate. Or a write-in. Or a focus on down-ballot candidates who will serve the nation honestly, try to heal its divisions, and work to solve its problems," the board wrote. "Whatever you do, however, resist the siren song of a dangerous demagogue. By all means vote, just not for Donald Trump."