One of the founders of Black Lives Matter has taken a swing at President Biden, saying he has betrayed the radical Marxist movement since pledging to give it a seat at the table during his 2020 presidential campaign.

In an interview with the Guardian, Patrisse Cullors blasted the "cowardice" of elected officials including Biden who have distanced themselves from the "defund the police" movement.

BLM cofounder swings at Biden

The "defund" movement took off in 2020 following the death of George Floyd, which sparked historic protests and riots in which Black Lives Matter played a central role. Biden, who was campaigning for president at the time, channeled the outrage and promised change.

But activists have since complained of being sidelined as Democrats have pushed back on "defund" rhetoric, which dealt lasting damage to the party's brand and became a staple of Republican attacks.

Cullors all but accused Biden of taking Black Lives Matter, which helped get him elected, for a ride.

"Millions of people went to the streets in 2020....and yet there has been deep cowardice from officials. The burden is on the officials who create the budgets for the police and other resources, who turn away from the violence and continue it in their departments," she said.

"It’s truly a failure of leadership at the highest level, all the way up to our president. This movement was able to help get Joe Biden into office, and yet in his first State of the Union address, he yelled: 'Fund the police,'" she said.

"Keep at it"

Nearly three years after the "mostly peaceful" George Floyd movement swept the nation, urgency in Washington to reform policing has appeared to die down, but Biden is promising to "keep at it" as he renews a dormant effort to pass the sweeping George Floyd Justice in Policing Act.

The push comes after the death of Tyre Nichols, who died after being beaten by Memphis police during a traffic stop in January.

Cullors criticized outreach from Biden Transportation Secretary Pete Buttigieg, who made a sympathetic phone call to Cullors after her cousin, Keenan Anderson, died following an encounter with police.

Buttigieg "could be helping lead a conversation about what federal dollars could fund programs to remove law enforcement from traffic stops," Cullors said.

Pot calling the kettle black

To his credit, Biden has gone to great lengths to inject "equity" -- a controversial ideology that advocates active discrimination in order to ensure racially based outcomes -- into his social agenda.

Cullors' criticism of Biden is also a bit ironic, given her own history.

As some may recall, Cullors, who is a Marxist, was accused of profiting off the BLM movement after she bought up millions of dollars in luxury real estate.