Compulsory voting
Compulsory voting is increasingly resented by citizens in some countries such as Brazil, the largest country where compulsory voting is enforced: at the last presidential election in 2014, some 30 million voters, about 21% of registered voters, did not vote, despite the fact that Brazil has some of the most severe penalties enforced against non voters.
Right of foreigners to vote
(EU member) Municipal voting rights are granted to citizens of countries which reciprocate by granting voting rights to Spanish citizens when reciprocity is enshrined in a bilateral treaty ratified by Spain, i.e. since 1997 the EU member states and Norway, but already since 1989-1990 Denmark, the Netherlands, Sweden and Norway. Bilateral treaties with Argentina (1988), Chile (1990) and Uruguay (1992) have never been enacted as voting rights are not enshrined in a specific law in Chile, and for the two other countries the instruments of ratification have never been exchanged, there are also similar "friendship treaties" with Colombia and Venezuela. There is an ongoing debate in Spain about either ratifying existing bilateral treaties or changing the constitution in order to grant all residents voting rights without reciprocity, but some Catalan parties are opposed to it.