For which incident is May Day celebrated?

 

The history behind celebrating Labor Day in May is-

This day is celebrated as International Workers' Day in memory of the martyrs who died in Hay Market in Chicago, USA in 1886. On that day, the workers gathered there demanding 8 hours of daily work. Someone threw a bomb at the police who were surrounding them, in response to which the police started firing at the workers. As a result about 10-12 workers and police were killed.

In 1889, on the centenary of the French Revolution, the First Congress of the Second International was held in Paris. Socialist revolutionary Raymond Lavin proposed that the anniversary of the Chicago protests from the 1890s be observed internationally. This was the beginning of International Workers' Day. In 1891, this proposal was formally accepted at the Second International Congress in Paris. May Day is recognized.

The first May Day was celebrated in India on May 1, 1923. Hindustan Labor Kisan Party was the first labor organization to organize May Day in India. What was then Madras, now known as Chennai; Workers gathered there and observed the day by hoisting red flags. Today May Day is a very important day for almost all central trade unions and other organizations in India.

But strangely, May Day is not celebrated in USA and Canada, the countries where this incident took place. The two countries celebrate Labor Day on the first Monday of September. The reason for this is that the then leaders thought that if Labor Day was observed in May, it would have a bad effect among the workers.