Elizabeth Warren is branching out.

The Massachusetts senator, who has made a career of unfairly maligning bankers and other alleged capitalist malefactors, is now smearing the criminal-justice system, too.

In a speech at a historically black college in New Orleans, she declared that “the hard truth about our criminal justice system: It’s racist . . . I mean front to back.”

Her riff is a sign that the Democrats are going to leaven their lurch toward socialism with a condemnation of America as fundamentally racist. After helping fuel Donald Trump’s rise in 2016 with loose rhetoric about the bigotry of cops, Democrats hope to dislodge him in 2020 with even more sweeping accusations of systematic racism.

The U.S. criminal-justice system is obviously a legitimate topic of debate. The war on drugs has been a blunderbuss mistake, and we should be reconsidering how many people we jail, and how we do it and why. But the contention that U.S. law enforcement is a product of racial hatred is a paranoid lie, from top to bottom, from beginning to end, from front to back.