Active since 2016 in widespread protests against tightening abortion laws under the conservative Law and Justice party, Lempart has been targeted by the government with arrests and legal charges, and faced death threats from opponents of the protests.

Her work has also included advocating for equal rights for members of Poland's LGBT community and for people with disabilities.

[6] After the conservative Law and Justice party came to power in 2015, Lempart began working with the Committee for the Defence of Democracy, a pro-European NGO.

[1][8][12] Lempart encouraged Catholics to take a stand against their church during the protests, which drew significant pushback.

[4][7] In February 2021, the Polish government charged Lempart with criminal felonies for her role in the women's strike protests and criticism of the Catholic Church, which she described as a form of political pressure on her movement.