The sister of a Saudi national imprisoned after tweets criticizing the government on Tuesday sued both Twitter and the kingdom, alleging they worked together to support "repression."The lawsuit filed in a US federal court in San Francisco, which named powerful Crown Prince Mohammed bin Salman as a conspirator, seeks a jury trial to determine damages.Abdulrahman al-Sadhan was working for the Red Crescent in Riyadh when he was taken away from the office in 2018 and later handed a 20-year jail sentence.