Your question suggests some confusion about redlining.

Redlining refers to the practice adopted by the Home Owners loan corporation and the Federal housing administration during the Great Depression. These agencies Refinanced underwater mortgages And insured mortgages, respectively during this time. Their goal was to rejuvenate the moribund housing market. To ensure that the federal government was not assuming undue risk, these agencies developed criteria for deciding which properties would be eligible for the respective programs. Houses in low income neighborhoods, with slum housing, undesirable land uses or that appeared posed to undergo racial transition were deemed to be too risky for the federal government to either refinance mortgages there or insure mortgages. Red lines were literally drawn on maps to designate these areas. Predominately black neighborhoods were disproportionately among those neighborhoods that were redlined. Richard Rothstein's Color of Law is a good source that describes this.

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The fair housing act of 1968 forbids discrimination based on an individual's race, creed, color, etc. in The sale, rental housing or financing of housing. So the law did not explicitly refer to redlining. Later federal laws including the Equal Credit Opportunity Act and the Community Reinvestment Act of 1974 and the Community Reinvestment Act of 1977 (which requires lenders to meet the credit needs of areas where they take in deposits) more explicitly addressed redlining.

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New York City passed the first Fair Housing law in 1968: https://www1.nyc.gov/site/cchr/about/commissions-history.page. There were a number of states that passed fair housing laws before 1968. Some 23 states had passed such laws prior to 1968. See: The housing market impact of state-level anti-discrimination laws, 1960-1970." Journal of Urban Economics

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