Up to 450,000 people gathered in Prague on Sunday to protest against proposed changes to the funding of public-service media, in what organizers say could be the Czech Republic’s largest demonstration since the 1989 Velvet Revolution.

Axar.az reports, citing Czech media, that Mikulas Minar, head of the organizing group Milion chvilek pro demokracii, estimated that between 350,000 and 450,000 people attended the rally at Letna Park. Police have not released an attendance estimate.

The protest was organized against legislation that would replace license-fee funding for Czech Television and Czech Radio with state-budget financing. Opponents fear the changes could make the broadcasters more vulnerable to political pressure, while Prime Minister Andrej Babis and coalition politicians have rejected claims that the government intends to exert control over the media.

The bill has passed its first reading in parliament and is awaiting further consideration. Demonstrators also criticized the government for pushing legislation through parliament without sufficient debate.

Letna Park was the site of mass demonstrations during the 1989 Velvet Revolution, when around 750,000 people gathered there on November 25.