"You all should remain disciplined. Those using my photographs in banners and posters should immediately stop the practise or strict disciplinary action will be taken against them. Party flags and stickers should also not be misused," Mr Yadav said while addressing party workers in Lucknow.
Stating that neither Congress nor BJP would get majority in 2014 Loksabha polls, Mr Yadav claimed it would be third-front, which would be getting the majority and form next government.
"The party should have target of winning all 80 seats from the state and workers should remain alert with propaganda of opposition parties", he said.
About corruption, Mr Yadav asked party workers to keep an eye on it and inform the party about it.
Later, talking to reporters, party spokesman Rajendra Chowdhury said that not only disciplinary action but legal action will also be taken again those misusing party flags and stickers.