Herschel Walker posted a video on his Twitter sharing his thoughts about learning Black Lives Matter is led by “trained Marxists.”

In the video, the former Georgia Bulldog, Heisman Trophy winner and NFL great asked the professional football community: “Is this who you are supporting? A trained Marxist tells you they are anti-government, -anti-American, anti-Christian, anti everything.”

Black Lives Matter co-founders Patrisse Cullors and Alicia  Garza have referred to themselves as “trained Marxists.”

Black Lives Matter co-founders Alicia Garza, left, and Patrisse Cullors have referred to themselves as “trained Marxists.” (Photo by Jemal Countess/Getty Images for The New York Women's Foundation)

“We are super-versed on, sort of, ideological theories. And I think that what we really tried to do is build a movement that could be utilized by many, many black folk,” Cullors said in the interview with Jared Ball of The Real News Network.

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Walker demanded answers from BLM: “Tell the American people exactly who you are standing for.”

He called for the American people that support the movement to justify their reasons: “When you talking BLM, are you supporting the group that is trained Marxists?”

Players have protested the national anthem and have worn decals on their helmets featuring the names of victims of violence, and end zones will feature phrases such as "End Racism." They've taken a knee during the national anthem and at times linked arms.

“First of all, it’s great unity but as I said early on, there shouldn't be politics in sport,” Walker told “The Story with Martha MacCallum."

He said the league, under the leadership of Roger Goodell, has allowed the protests, but he asked: "What's the end game?"

“The players do have a right to protest, but they must realize that fans have a right to protest as well,” he continued. “So if they boo, you can't be upset. If they don't watch the show, you can't be upset.”

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Walker emphasized that these protests do not achieve the end goal being sought out and the only way to see change is by acting.

“Instead of everybody having their folded arms and closed fists, why don't we have an open hand?” he asked. “We all come together, and I’d love to go with you, the NFL, all major league sports, let's go to Washington. Let's get the Democratic, let's get the Republican people together."