Poland’s electoral authority said that the former ruling right-wing party violated campaign funding rules in the 2023 parliamentary vote.
It imposed a penalty worth nearly £2 million that would undercut the party’s resources for next year’s presidential election.
The State Electoral Commission said that the campaign of the Law and Justice party, which ruled Poland from 2015-2023 and is now the main opposition force, improperly took 3.6 million zlotys (£706,569) in public money.
The penalties, which are subject to appeal, would significantly reduce the party’s resources for the 2025 presidential election, in which it will seek to maintain its control of that office.
Mateusz Morawiecki, who served as Law and Justice prime minister, said the decisions was “shameful” and was part of a “political game of the current government whose goal is revenge and pushing the opposition to the margin”.
He said the government wants to weaken Law and Justice ahead of the presidential election, and that the party would appeal the decision to the Supreme Court.
Earlier this month, party leader Jaroslaw Kaczynski said that the commission was acting under pressure from the current centrist and pro-European Union government of Prime Minister Donald Tusk.
Mr Kaczynski said any punitive decision would spell the end of democracy in Poland.
The commission’s decision can be appealed to the Supreme Court, where Law and Justice still holds some control.
The court’s verdict would be binding and final.
The electoral commission is obliged by law to review the financial reports of all parties that ran in an election, and any funds exceeding the party’s budget by more than 1% must be returned and a fine is imposed.
The Euro-sceptic Law and Justice party, which had put Poland on a collision course with Brussels, was the biggest single vote-getter in the October 15 general election, but a coalition led by Mr Tusk won a comfortable majority of seats in parliament, removing the conservatives from power.
Ever since, the government has been investigating its predecessor on accusations of abusing power and state finances.
Mr Kaczynski and his supporters call the efforts a politically motivated attempt to undermine the opposition.