A Sudanese emergency court sentenced Mariam Sadiq al-Mahdi, the deputy head of the opposition Umma Party and daughter of its leader.
Mariam was sentenced to one week in prison on Sunday, party officials said.
Mahdi was one of 19 party members sentenced by the court and was also fined 2,000 Sudanese pounds ($42).
Mariam with other opposition leaders was protesting calling on President Omar al-Bashir to step down, the officials said, Citizen Digital reports.