Disenfranchisement

Suffrage

The right to vote, and the historical question of who holds it — the franchise has expanded and contracted repeatedly in most countries.

Voter purge

The removal of names from the roll — necessary maintenance when it removes the deceased and relocated, disenfranchisement when it removes eligible voters.

Franchise restriction

A change narrowing who may vote or how easily — a category the site tracks separately from expansions, because the direction of travel is the point.