The Sanation government invalidated the May 1930 election results by disbanding the parliament in August and with increasing pressure on the opposition started a new campaign, the new elections being scheduled to November. Using the anti-government demonstrations as a pretext, 20 members of the opposition parties, including most of the leaders of "Centrolew" alliance (from the Socialists, Polish People's Party "Piast" and Polish People's Party "Wyzwolenie") were arrested in September without a warrant, only on the order of Piłsudski and the then-Minister of Internal Security, Felicjan Sławoj Składkowski, accusing them of plotting an anti-government coup. The opposition members (who included the former prime minister Wincenty Witos, and Wojciech Korfanty) were imprisoned in the Brest Fortress, where their trial took place (thus the popular name for the election: the 'Brest election'). A number of less known activists were arrested throughout the country. They were released after the end of the election in the same month. The Brest trial ended in January 1932, with 10 accused receiving sentences up to three years of imprisonment; the appeals of 1933 confirmed the sentences. The government however gave the accused choice of emigrating: five of them took it, the other five to serve the prison term instead.