Thousands of members of the Korean Confederation of Trade Unions (KCTU) took part in nationwide demonstrations, according to the group.
Unionists dressed up in pink jumpsuits and masks with white circle, square or triangle symbols worn by guards in "Squid Game" were seen beating drums to loud music and dancing.
The Seoul city government said on Thursday (October 21) it had filed a police complaint against the group for defying COVID-19 curbs by staging illegal protests, violating the infectious disease prevention law. Only one-person protests are allowed in the capital and surrounding areas under current social distancing rules.
The restrictions violate the basic rights granted by the Constitution and it is unfair that outdoor rallies are seen as more dangerous than sporting events where more spectators are allowed, KCTU spokesman Han Sang-jin told Reuters, when asked about the police complaint.