The gift from Bezos, who also owns the Washington Post newspaper, was announced at the organization's awards dinner yesterday.
"This generous gift will help us continue to grow, to offer our legal and educational support to many more news organizations, and to expand our services to independent journalists, nonprofit newsrooms and documentary filmmakers," Reporters Committee chairman David Boardman said.
"We'll also be better positioned to help local newsrooms, the places hit hardest by the disruption in the news industry and whose survival is every bit as crucial to American democracy as those entities headquartered in Washington and New York."
First Look, a news organization established by eBay founder Pierre Omidyar, announced separately yesterday it will increase its funding for its press freedom fund to USD 2 million and offer an additional USD 2 million in matching funds.
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Both Bezos and Omidyar in recent months have cited a need for efforts to support an independent press.
Bezos said last year during President Donald Trump's campaign that the candidate was "working to freeze or chill the media that are examining him."
Omidyar said in a tweet about the initiative last month: "The fight against misinformation, authoritarian lies, and online abuse is a fight we can win.