[12] From 2015 to 2018, she served as the coordinator of youth initiatives for the city of Gennevilliers, before becoming the head of community life and citizenship for the department of Stains.

[13] Upon her arrival in Paris in 2005, she joined Génération précaire, an organization that denounced the conditions of interns through heavily mediatized actions.

[14] In 2006, she co-founded Jeudi noir, an organization which aimed to shine light on the housing crisis through squats and mediatized festive actions.

[24][25] In parallel, Leïla Chaibi was among the initiators of Nuit Debout, a nationwide movement in 2016 that opposed the proposed labor reforms known as the El Khomri law.

She denounced the treatment of workers, environmental pollution, and the traffic of "a thousand trucks a day" which "ruins" the lives of local residents.

She is also the author of an open letter co-signed by thirty European elected representatives, calling on Amazon CEO Jeff Bezos to respond to allegations of spying on employees and politicians.

[40] She is behind an independent study on the impact of e-commerce on employment, which concluded that "82,000 jobs have been lost in France in ten years due to online sales platforms ".

[41] Leïla Chaibi denounced President Emmanuel Macron's decision to award the Legion of Honor to Jeff Bezos, the CEO of Amazon.

[43] In April 2023, Leïla Chaibi opposed the extension of the carbon market proposed by the European Parliament, perceiving the threat of "an increase in petrol and heating prices".

In May 2023, in response to President Emmanuel Macron's call for a "pause" in European environmental regulation, Leïla Chaibi declared that left-wing forces must "stand together" to "protect people and nature".

[47] At the European Parliament, Leïla Chaibi, alongside several other female MEPs, denounced the harassment suffered by women on social networks, describing the insults she received on the Internet.

She took part in the international "Toxitour" mission where MEPs visited Mexico between 2 and 11 December 2019, to assess the effects of the EU-Mexico free trade agreement.

Leïla Chaibi denounced an "environmental, sanitary and social disaster", pledging to demand sanctions against companies that dump contaminated water in rivers.

[53][54][55] In August 2022, she endorsed Chile's first draft of a new constitution, describing it as a "solid foundation for an egalitarian democracy that will inspire people across the world".

[56] Leïla Chaibi is a board member of the Progressive International, alongside figures such as American author Noam Chomsky, former Ecuadorian president Rafael Correa and Canadian journalist Naomi Klein.

[62] Causette praised a “short but powerful account” in which “[we see Leïla Chaibi] elude the traps of the lobbies, convince the most austere commissioners and above all... fight against Emmanuel Macron's agenda”.