Consider the following statements regarding Mahatma Gandhi's engagement with British colonial rule:

1. Gandhi played a leading role in the campaign that eventually ended the system of indentured labour.

2. At Lord Chelmsford's War Conference of 1918, Gandhi opposed the resolution to recruit Indians for the war effort.

3. The Indian National Congress was declared an illegal organisation following the movement that began with the Salt Satyagraha.

Which of the statements given above is/are correct?