What was the Duma? How far was it successful?

What was the Duma? How far was it successful?
Answer:
Duma was an elected legislative body like the parliament having representatives of the third estate. The Tsar dismissed the first Duma within 75 days and the re-elected Second Duma within three months. He did not want any restrictions or reductions in his powers. He changed the voting laws and packed the Third Duma with the conservative politicians. Liberals and revolutionaries were kept out.