Up to 250,000 protesters took part in a demonstration in the Czech Republic demanding that Prime Minister Andrej Babis step down over allegations of corruption.
The protest was the largest in the country since the fall of communism in 1989.
The 64-year-old billionaire was charged last year in connection with a €2m EU subsidy scam, while an audit by the European Commission ruled that he has a conflict of interest as a politician and entrepreneur.
The EU is probing his dual role as a politician and entrepreneur, and Mr Babis also faces allegations that he served as a secret Communist police agent in the 1980s.
The Czech government said earlier this month there were "errors" in the audit from Brussels and Mr Babis has refused to budge.
Mikulas Minar, the head of Million Moments for Democracy, the NGO organising the protest, said: "Judging from the aerial photos, it looks like we're about 250,000. We'll see how many more people will still arrive".
"We're fed up with what Babis is doing, how he manages the country," Mila Stiburkova, a 39-year-old sales manager from the central Czech town of Sazava, told AFP.
"We don't like him pocketing money and fooling people who trust him," added Stiburkova, who like many protesters, travelled to Prague for the event.
Mr Babis, the second wealthiest Czech according to Forbes, leads the centrist populist ANO movement, which, despite the controversy, won May's elections to the European Parliament.
ANO took office after winning the 2017 general election campaigning on an anti-corruption ticket in EU and NATO country of 10.6 million plagued by political corruption.
It teamed up with the leftwing Social Democrats to form a minority coalition withtacit backing from the Communists for a parliamentary majority.
Mr Babis, a former Communist, is the first politician since the 1989 fall of Communism in former Czechoslovakia to let the Communists have a role in government.
Despite the allegations, which Babis fervently denies, ANO, described as a one-man party by critics, enjoys a steady 30% voter support in opinion polls.
"I don't understand how this man (Babis) can go on. His political ambitions are in conflict of interest with everything. He's abusing all subsidy and incentive systems, tax reliefs," Martin Peroutka, a 45-year-old businessman from the northern town of Usti nad Labem, told AFP.
"The protests should continue, it's an expression of democracy," he added.
The rally is the latest in a series of protests against Mr Babis and new Justice Minister Marie Benesova, which started as Ms Benesova took office in April.
The organisers, who fear Ms Benesova was appointed to clear Mr Babis of his charges, brought about 100,000 protesters to Prague's central Wenceslas Square in early June as the protests gradually increased.
Mass protests in neighbouring Slovakia over the February 2018 murder of journalist Jan Kuciak who was investigating high-level political corrpution brought down the government of leftist populist Robert Fico.
On its Facebook page, the Million Moments for Democracy group said Mr Babis's "multiple conflicts of interest" were unacceptable.
