The Simon Commission of 1927 was boycotted primarily because there was no Indian member in the Commission. The British government appointed the Simon Commission to review and suggest reforms to the constitutional framework of British India. However, the absence of any Indian representative in the Commission was seen as an insult to the Indian people and their aspirations for self-governance.

The Indian National Congress, the leading political party at the time, called for a boycott of the Simon Commission. The Congress felt that any constitutional reforms should be made by a commission that includes Indian representatives who can accurately reflect the aspirations and interests of the Indian people.

The boycott of the Simon Commission was a significant event in the Indian independence movement and marked a turning point in the struggle for self-rule. It demonstrated the growing unity and determination of the Indian people to demand their rights and challenge British colonial rule.

While Congress did believe that the people of India were entitled to self-rule or Swaraj, the primary reason for boycotting the Simon Commission was the absence of Indian representation rather than specific differences among the members or support for the Muslim League.