"National Alliance heads Raivis Dzintars and Imants Parādnieks are receiving huge sums from the mafioso insolvency administrators. These look like regular bribes. I have documents to prove it," said JKP figurehead Juris Jurašs, a former employee of the Corruption Prevention and Combating Bureau (KNAB).
He did not publish the documents but claimed the documents show that Raivis Dzintars has received more than €100,000 from the former insolvency administrator Aigars Lūsis; and Imants Parādnieks and his wife received €500,000.
Jurašs said that he submitted the documents to the country's anti-graft authorities.
"Asking comment on this is like asking to comment the nightmares of a sick cat," Imants Parādnieks told LTV initially.
The next day, however, he said that his wife received a €11,000 loan from Lūsis in 2011, and it's being repaid. He himself, Parādnieks said, has never received money from Lūsis.
Meanwhile Dzintars admitted he had borrowed 4,000 lats (€5,680) from Lūsis in 2011. He also published a bank notice that seems to corroborate what he's saying. Lūsis did not offer comment.
Dzintars also said that he has turned to the Security Police, Latvia's interior police force, to check whether this isn't a provocation organized by Russia.
"It's a method used in other European countries as well to affect the outcome of the election and get Kremlin-friendly politicians into power," said Dzintars.
Politics expert Juris Rozenvalds, meanwhile, says the public accusations can be accounted for by the fact the two parties are fighting for the same electorate.
"JKP is the most direct competitor of National Alliance... In principle, these political forces are oriented towards a very similar electorate," said Rozenvalds.
He said that similar announcements are to expected, for example, about the political forces responsible for introducing the so-called mandatory purchase component fees for electricity and ostensibly supporting green energy.
These are widely seen as a financial catastrophe for the country.