TV3's Nothing Personal broadcast reported on Sunday that Unity allegedly used the system created by the IT company SOAAR to elect congresses for eight years without pay.
The KNAB confirmed to LETA that the Bureau started an investigation on April 18, in response to information received.
Under the regulatory framework, legal persons are prohibited from financing political organizations in any way, including the provision of services to them free of charge.
If these activities have been performed, they shall be regarded as illegal financing of a political organization within the meaning of the Law on the Financing of Political Organizations, the Bureau said.
KNAB said that to be able to start criminal proceedings for possible illegal funding of the party, the illegal donation must have been made in large amounts, which is 50 minimum monthly wages or 35,000 euros.
SOAAR also appears in a criminal case for alleged large-scale fraud of funds from the Central Election Commission (CVK) budget, in which the prosecution has brought charges against former CVK chairwoman Kristīne Bērziņa, two other Commission employees and a representative of SOAAR.