It is also called May Day and honours workers and labour rights.
The day originated from the Haymarket Affair (1886) in Chicago, United States of America.
In India, it was first celebrated in 1923 in Chennai by the Labour Kisan Party of Hindustan (Workers and Peasants Party of India).
Led by pioneer communist leader Malayapuram Singaravelu, this historic event saw the first-ever usage of the red flag in India to symbolize workers' unity and rights.
The theme for the year 2026 is “Ensuring a Healthy Psychosocial Working Environment.”