I was not successful in finding an exact equivalent Italian word for disenfranchise neither in Google nor in WordReference.
From the Merriam-Webster dictionary
disenfranchise transitive verb: to deprive of a franchise, of a legal right, or of some privilege or immunity especially: to deprive of the right to vote
In the Wordreference dictionary I can only find
Privare del diritto di voto.
Obviously this is a phrase that conveys the meaning of the word disenfranchise. However I'd like to know if there is a single Italian word expressing the same meaning.