The announcement came a day before Yadav's faction holds its national council meeting, and after they went to the Election Commission to stake claim over the party's symbol.
Lashing out at the government over demonetisation of high-value currency in November and the Goods and Services Tax rollout, Yadav said both the steps devastated the economy, especially small and medium enterprises.
He asserted that the next Lok Sabha election, due in 2019, would be fought on economic issues.
He dismissed as an "eyewash" the changes the GST Council made yesterday to give relief to small and medium businesses, and said they were meant to divert people's attention at a time when anger was building up against the government.
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"The truth is that the kind of 'inspector raaj' we see today has never been witnessed before. Accounting mistakes like filing wrong entries have been criminalised and traders can be jailed... We (the opposition) will soon launch a big nationwide movement," he said.
Yadav said Bihar had seen many small communal incidents during Dussehra and Muharram - "something, that never happened before" - and blamed the BJP for the serious development.
Claiming that a majority of JD(U) leaders was with their faction, Arun Shrivastav, a close aide of Yadav, said anywhere between 500 to 600 of 1,045 national council members of the party will attend the meeting tomorrow.
Rajya Sabha member and Kerala JD(U) chief M P Veerendra Kumar will also attend the exercise, he said. He announced that former Bengaluru police commissioner P K Ramaiah, who was present, has joined the party.
The Kumar-led party has dismissed Yadav faction's claim and is said to have submitted affidavits of most of its MPs, MLAs and office-bearers, affirming their support to the Bihar chief minister.
Yadav also termed the National Green Tribunal's order to ban protests at the Jantar Mantar as "unjust" and said the alternative venue, Ramlila Maidan, was in a populated area which makes public protests there difficult.