Two female opposition lawmakers in Mauritania were sentenced Monday to four years in prison after insulting the president and making claims of racial bias.

Mariem Cheikh and Ghamou Achour were accused of describing President Mohamed Ould Ghazouani on social media as the mentor of “apartheid in Mauritania.” They are both members of the human rights group, the Initiative for the Resurgence of the Abolitionist Movement.

They were charged last month with “attacking the symbols of the state” and “calling for gatherings with a view to undermine public security.”

The two lawmakers had called in several social media posts for Ghazouani’s removal and accused the Arab-dominated justice system of treating Black citizens and descendants of slaves as second-class citizens.

A court in the capital Nouakchott also ordered the removal of their digital content, the confiscation of their phones and the closure of their online accounts.

Mauritania has long been denounced for human rights abuses, with the continuous existence of slavery casting a long shadow over its history. For centuries, the country’s economic and political elite of Arab and Amazigh people enslaved Black people from the northwest Sahara.

Mauritania was the last country in the world to outlaw slavery in 1981, but the practice continues, human rights groups say, with around 149,000 people in modern slavery in this nation of less than 5 million going by the 2023 Global Slavery Index.

Biram Dah Abeid, leader of the Initiative for the Resurgence of the Abolitionist Movement coalition group, condemned the trial as unjust and politically motivated, calling the two lawmakers “heroes” and “sincere fighters against injustice,” at a news conference after the verdict.

The lawmakers are with the coalition, which is not a registered political party but allied with the registered Sawab party to help them get elected.