In the case of plessy v. Ferguson, what did homer plessy refuse to do

This 1896 U. S. Supreme Court case upheld the constitutionality of segregation under the "separate but equal" doctrine. It stemmed from an 1892 incident in which African-American train passenger Homer Plessy refused to sit in a Jim Crow car, breaking a Louisiana law.

Homer Plessy refused to sit in a Jim Crow car, breaking a Louisiana law.