WASHINGTON — The Justice Department has announced a cross-government effort to investigate and prosecute redlining, the practice of banks discriminating against racial minorities or certain neighborhoods.

As part of the effort, the Justice Department as well as the Consumer Financial Protection Bureau and the Office of the Comptroller of the Currency also announced a new case against Trustmark Bank for its treatment of Black and Hispanic borrowers in Memphis, Tenn.

Despite a half-century of laws designed to combat redlining, the racist practice continues across the country and the long-term effects are still felt to this day. The average net worth of a Black family is a fraction of a typical white household, and homes found in historically redlined neighborhoods are still worth less than homes found in non-redlined communities.

“Lending discrimination runs counter to fundamental promises of our economic system,” said Attorney General Merrick Garland, in prepared remarks.