His previous work had included successfully challenging segregated swimming pools and other public facilities in Riverside, California. This background meant he had already worked through some of the legal issues that would arise in a challenge to school segregation: what constitutional provisions applied, how to frame the harm, what evidence would be necessary, and how to manage the relationship between federal constitutional arguments and state-level practices.
The decision to file in federal court rather than state court was significant. A state court challenge to school segregation practices would have faced a different legal landscape and different procedural hurdles. Filing in federal court on Fourteenth Amendment grounds put the case in front of judges appointed by the federal government and gave the ruling, if favorable, a different kind of authority.
Marcus also made two structural choices that shaped the case’s impact. First, he expanded the individual enrollment disputes into a class action representing approximately 5,000 children of Mexican and Latin American ancestry in the four school districts. This reframed the litigation from a dispute about particular children’s school assignments into a challenge to a systemic practice affecting thousands of students. The class action structure made it much harder for the districts to treat the case as an isolated administrative decision about specific families.
Second, Marcus decided to present social scientific testimony about the psychological and educational effects of segregation, rather than limiting the case to a comparison of physical facilities. This was the more ambitious and more novel approach. It required finding experts willing to testify about harm that was not easily quantifiable — not a count of missing textbooks or a measurement of building square footage, but an account of what segregation did to children’s sense of themselves and their relationship to American society.