deprive of a right(deprive sb/something of something to prevent sb from having or doing something, especially something important: They were imprisoned and deprived of their basic rights. OALD Alexander Demidov)
exclude someone from the right to vote(If residence requirements apply to registration, they must be reasonable, and should not be imposed in such a way as to exclude the homeless from the right to vote Taras)
strip someone of their voting rights(The convention allows ECOWAS to impose sanctions, suspend loans and strip violators of their voting rights if member States fail to comply with restrictions on the manufacturing and importation of small arms and light weapons Taras)
be denied a voice(We on Nauru wholeheartedly believe that the Republic of China on Taiwan has a part to play in this Organization, and its people should not be denied a voice in this world body Taras)