Human Rights campaigners in Tanzania say the government targets opponents ahead of local elections in December and a national vote in 2025.
The comments follow an incident where unidentified people abducted, beat and seriously injured a senior Tanzanian opposition party official, Aisha Machano, before dumping her in a forest.
Machano is the second senior opposition official to be abducted and tortured within two months.
The first one was, Ali Kibao, a member of CHADEMA's secretariat, who was kidnapped from a bus by armed men early while travelling from Dar es Salaam to the coastal city of Tanga.
Lulu Gaboo spoke to Amnesty International Regional Researcher for Tanzania, Roland Ebole.