BJP leaders Kalraj Mishra and Kirit Somaiya claimed, in a press conference, that the party has found over 125 companies connected with Mayawati's "friends and family".
These entities have been used to "hide" money amassed through "scams" and funds collected through land allotments made in Noida, they alleged.
They also alleged that Congress was protecting Mayawati despite having evidence against the BSP chief.
"In fact, both the parties are defending each other in their scams...the government of India has all the documentary evidences and it should take action," Somaiya said.
He said a letter written by the Enforcement Directorate to Noida Authority was proof that the Centre was aware of the goings-on in Uttar Pradesh.
The party also released a list of 26 companies, in which, it claimed, Mayawati's brother Anand Kumar and his wife Vichitralata have stakes. Earlier, it had released a list of 25 such entities.
"We will give details of the entities to the ten main investigative agencies like ED and CBI seeking action, besides handing over a memorandum to the UP Governor. If no action is taken, we will be forced to move court," Somaiya said.
The BJP leaders claimed that they have personally checked two addresses in which as many companies are registered and found them to be fake.