Bahujan Samaj Party (BSP) national secretary Paramdev Yada resigned from the party on 10 July.
His announcement comes on the heels of the resignations of party leaders RK Chowdhary and Ravindra Nath Tripathi as well as senior party leader Swami Prasad Maurya - who left last month.
Yadav, who resigned from the party after serving it for nearly 35 years, alleged that under Mayawati's leadership, the interests of the Dalits were "being mortgaged to the people with money bags".
According to media reports, Yadav dubbed the BSP as a 'grocery store' where money could buy anything from tickets to party posts.
He alleged that the people who have no background and no loyalty to the party were made MLCs while dedicated workers like him were being sidelined.
--With agency inputs