Pauline Pearce, dubbed the Hackney Heroine after she took a stand against looters during the 2011 London riots, has posted this video accusing the Lib Dems of "underhand racism" and "neanderthal views on diversity, inclusivity, and accessibility".
Pearce, a member of the Liberal Democrats, was standing to be president of the party. But in a video posted to her Facebook page she says she is no longer willing to be involved, in part because the Lib Dems have not offered enough support to her or other individuals from ethnic minority backgrounds.
Pearce claims she was "ridiculed for my past as an ex-convict" by opponents within the Lib Dems, despite the party professing to offer second chances.
She says she felt "patronised" by people within the Lib Dems, and says that while the party pretends to be inclusive it acts differently.
And she says she was ridiculed by individuals within the party for having a lack of political experience when she ran for the role.
Pearce came to fame after she was videoed during the 2011 London riots shouting at looters stealing from shops in Hackney.
Pearce says she'll remain a member of the Lib Dems and be "the token person who sits and smiles in the background" since she realises she cannot climb any higher.
In response the Lib Dems issued a statement: "We are upset that Pauline feels she has been subjected to discrimination and prejudice, as this behaviour is the opposite of the values of equality and respect we embrace and pride ourselves on as a party. We urge Pauline to report what she has experienced and will look at her concerns as a matter of urgency."