Before 21 May 1998, Indonesian labors were not allowed to celebrate the First of May a.k.a May Day.
Because until that date, Indonesia was ruled by pro-capitalist governments who think that only Socialists and Communists celebrate that day. For the same reason the use of the word Labor was changed to Worker. And there is a single central national-based labor organization recognized by the government.
After that, Indonesia became a democratic country and Labors are allowed to celebrate the May Day, and express whatever opinion and react against anyone they do not like any time they want.
Unfortunately, labors are not united, there is not a strong national based organization, each of them with its own agenda.
Considering the above, I hope that labors in Indonesia would make their best efforts to be united so that their voices can be heard and taken into account. Otherwise they would only be victims of circumstances i.e. used as tools by others, especially politicians.