Voter suppression is a strategy to influence the outcome of an election by discouraging or preventing people from exercising the right to vote. It is distinguished from political campaigning in that campaigning attempts to change likely voting behavior by changing the opinions of potential voters through persuasion and organization. Voter suppression instead attempts to reduce the number of voters who might vote against the candidate or proposition advocated by the suppressors.
The tactics of voter suppression can range from minor "dirty tricks" that make voting inconvenient, up to blatantly illegal activities that physically intimidate prospective voters to prevent them from casting ballots. Voter suppression could be particularly effective if a significant amount of voters are intimidated individually because the voter might not consider his or her single vote important.