[13] An investigation into a potential far-right extremist network operating within the Hessian police was subsequently launched by the state government.

[6] Prior to submitting her application, she resigned from Marx21 [de] and the Socialist Left, stating that it was customary for candidates to terminate their association with internal factions.

[citation needed] Wissler was elected federal co-chairwoman at a party conference on 27 February 2021, winning 84.2% of votes cast.

[2] On 2 May 2021, Wissler was announced as one of The Left's lead candidates for the 2021 German federal election, alongside Dietmar Bartsch.

[15] The Left won 4.9% of party list votes in the election, narrowly falling short of the 5% electoral threshold, but re-entered the Bundestag due to winning three direct constituencies.

[17] After co-leader Susanne Hennig-Wellsow resigned in April 2022, elections for both co-chairpersons were held at a party congress in June.

Despite ongoing controversy due to election defeats and sexual abuse allegations within the party, Wissler announced her intention to seek re-election.

"[20] In 2020, she stated that her party must stand up for justice, ecology, and peace at home and abroad, acting as a force that "supports concrete struggles and represents an anti-capitalist perspective".

She was portrayed as a contrast to then-Minister-President of Hesse Roland Koch, a noted conservative from the right wing of the Christian Democratic Union of Germany (CDU).

The Frankfurter Allgemeine Zeitung reported that deputies from other parties preferred to work with her than her counterpart van Ooyen.

The Hessian CDU described her statements about parliamentarism and revolution as "particularly worrying" and evidence of the "partially anti-constitutional" nature of her party, claiming they represent its "turning away from parliamentary democracy".

[19] Her election as co-Landtag leader was received with some controversy within her own party due to her association with Marx21 (formerly Linksruck), which is recognised by the Bundesverfassungsschutz as an extremist group.

[21] At demonstrations against the opening of the Seat of the European Central Bank on 18 March 2015, Wissler worked as a parliamentary observer and accompanied the Italian rainbow group.