In a statement, AAP said Yadav was formerly the Chairperson of OBC Commission Delhi.
"He was last serving on the Congress Delhi Manifesto Committee and Election Committee. He had contested Delhi assembly election in 2015 from Rithala constituency," the AAP said.
Apart from Jagdish Yadav, Congress' Vijay Vihar Block President Vikas Yadav also joined the party.
"BJP's Bansi Dogra has also joined the AAP," the statement added.