I'm specifically asking for DIRECT bias so basically everything that isn't "One person = one vote". (So no Citizens United: That decision didn't allow 'organizations' to cast votes DIRECTLY so for this question it doesn't count. Neither voter registration)
- Discrimination based on gender often lead to the result that women weren't allowed to vote. See Switzerland which only came around to it in 1990 (The last district of Switzerland only implemented it in 1990, others did earlier).
- Discrimination based on race, e.g. under Apartheid.
- Voting based on taxes payed. Which e.g. existed in the US until President Jackson, large parts of Europe (Known as Zensuswahlrecht in the German speaking parts) or Japan (3級制選挙).
- Felony disenfranchisement
- Additional votes based on owning a business in Australia
What are other examples in those categories or even other categories and the country that has this bias?