Consider the following statements regarding the Russian Revolution: I. The incident known as 'Bloody Sunday' started a series of events known as the 1905 Revolution. II. Lawyers, doctors, engineers and other middle-class workers established the Union of Unions and demanded a Constituent Assembly. Which of the statements given above is/are correct?

Both statements are correct. 'Bloody Sunday' refers to the massacre of peaceful protesters led by Father Gapon in St. Petersburg on 22 January 1905, which triggered the chain of events known as the 1905 Russian Revolution. During this revolution, middle-class professionals — lawyers, doctors, engineers and other workers — organized themselves into the Union of Unions and demanded the formation of a Constituent Assembly.