Besides blacks, the Jim Crow laws in most States also disenfranchised most of the white working class.
Emphasis.
While the disenfranchisement and terror against blacks was far far worse than what many lower class whites got, there was a genuine mortal fear among landed aristocrats in the South about what was going on in the North among the immigrant working class that machines like Tammany Hall relied upon. The popularity of the
Land League, in particular, must've been very unsettling to the landed aristocrats.