Because the Houston Independent School District was slow to desegregate public schools, on June 1, 1970, the Federal officials struck the HISD plan down and forced it to adopt zoning laws. This was 16 years after the landmark Supreme Court ruling in "Brown v. Board of Education", which determined that segregated schools were inherently unequal. Racial tensions over integration of the schools continued. Some Hispanic Americans felt they were being discriminated against when they were being put with only African-Americans as part of the desegregation plan, so many took their children out of the schools and put them in "huelgas", or protest schools, until a ruling in 1973 satisfied their demands.