That history is not entirely correct. Typically private enterprise has been against segregation: Think about it, it is pretty expensive to have to maintain two sets of facilities for society. The montgomery bus company was AGAINST segregation when the laws forcing bus segregation were passed. Barry Goldwater donated a ton of money in the early days first NAACP chapter in Arizona in part because segregating his department store would be expensive for operations.
As for Unions, think about it, their major threat is cheap labor from abroad, so the way that they have historically been discriminatory has been in lobbying for anti-immigration and immigration quota (don't know if they still do that as much).
>...Typically private enterprise has been against segregation
Unclear why you were downvoted. Another example of this was Plessy v. Ferguson where the railroad worked with a civil rights group to bring the case:
>...On June 7, 1892, Plessy bought a first-class ticket at the Press Street Depot and boarded a "Whites Only" car of the East Louisiana Railroad in New Orleans, Louisiana, bound for Covington, Louisiana.[11] The railroad company, which had opposed the law on the grounds that it would require the purchase of more railcars, had been previously informed of Plessy's racial lineage, and the intent to challenge the law.
As for Unions, think about it, their major threat is cheap labor from abroad, so the way that they have historically been discriminatory has been in lobbying for anti-immigration and immigration quota (don't know if they still do that as much).