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.
Voter suppression
In Australia, it is mandatory for citizens to enroll to vote and it is their responsibility to update their enrollment when they change their address. Even so, it is estimated that about 6% of eligible Australian voters are not enrolled, or are enrolled incorrectly. These are disproportionately younger voters, many of whom might neglect to enroll when they attain voting age.