Sen. Elizabeth Warren Elizabeth WarrenHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Democratic senators ask inspector general to investigate IRS use of location tracking service MORE (D-Mass.) sharply criticized a Supreme Court ruling against busing in her first law review article published more than 40 years ago.

In her 1975 article for the Rutgers Law Review, Warren denounced a Supreme Court ruling in the Milliken v. Bradley case, writing that the decision made it easier for school districts to forgo busing students in northern U.S. cities, CNN’s KFILE reported Saturday.

The ruling maintained that a majority-black school district could not bus students from majority-white suburban districts to desegregate schools unless suburban districts were also engaged in illegal segregation practices.

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In her article, Warren wrote that de facto segregation, which occurs as a result of social norms, prejudices and self-selection, and de jure segregation, which existed because of laws mandating racial segregation, had been silently "reaffirm[ed]" by the court’s ruling, predicting that such segregation would dominate public schools, CNN reported.

“Effectively separate schools, even if equal, and certainly if unequal, are condemned by the Constitution, regardless of the reason for the separation,” Warren wrote.

Warren wrote that the ruling, along with another that upheld the state system of funding public schools by local taxes, would "lead to central-city schools which are inferior in facilities, student-teacher ratios, and other educational advantages because the funding is not commensurate with that available for suburban schools."

Warren wrote at the time that the decision "could thus be the 'separate and unequal' schools" and called on Congress to "develop a judicial remedy for urban school segregation."

Warren's communications director, Kristen Orthman, told CNN that the senator and 2020 hopeful still stands by what she wrote decades ago as well as legislation to "support voluntary local efforts to increase racial diversity and socioeconomic diversity."

"In addition, if localities are not taking action to desegregate schools, Elizabeth believes the federal government has a constitutional obligation to step in to deliver on the promise of Brown v. Board, including, if necessary, busing," Orthman said.

A Warren campaign spokesperson did not immediately respond to a request for comment from The Hill.

Warren's stance on busing contrasts sharply with that of Democratic front-runner Joe Biden Joe BidenPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Fox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio MORE during the same period.

"Nobody is more committed to equal educational opportunity than I," Biden told The Morning News, a Wilmington newspaper, in 1977, according to KFILE. "But busing is not the way. It was a bad idea in theory, and it has turned out to be even worse in practice."

Another CNN KFILE investigation found that the former vice president reportedly said in an interview nearly 40 years ago that he was against busing to racially integrate schools and that the practice was the "least effective remedy" for segregation.

Biden doubled down on his position in an interview with CNN this week, saying his position against federally mandated busing was "taken out of context" by Sen. Kamala Harris Kamala HarrisHundreds of lawyers from nation's oldest African American sorority join effort to fight voter suppression Biden picks up endorsement from progressive climate group 350 Action 3 reasons why Biden is misreading the politics of court packing MORE (D-Calif.) during the first Democratic presidential debate last week.

Harris tore into Biden during the Democratic debate for his previous stance on busing, describing how she benefited from the practice as a schoolgirl in Berkeley, Calif.

"There was a little girl in California who was part of the second class to integrate her public schools and she was bused to school every day," Harris said at one point to Biden. "That little girl was me."

Biden called Harris's criticism a "mischaracterization" of his views. He defended his views following the debate, saying on MSNBC later that he "supported busing to eliminate de jure segregation."