Which court case set the precedent for access to education within the united states for students with disabilities? mills v. board of education of the district of columbia citizens united v. federal election commission plessy v. ferguson brown v. the board of education?

Mills vs. Board of Education was a lawsuit filed against the District of Columbia in the early 70s. The lawsuit was on the behalf of 7 disabled children who were denied access to a public school education because it was thought that their needs were too great for them to be able to be educated in a public school setting (it was also said by the Board that it would be too expensive to educate them).