Marx21

Left Shift (German: Linksruck) was a Trotskyist group in Germany, which was the German affiliate of the International Socialist Tendency (the network founded by the British Socialist Workers Party). In September 2007 Linksruck formally dissolved, and its members regrouped into the Left Party as Marx21 - Network for International Socialism.

Linksruck's origins lie in the Socialist Workers' Group (Sozialistische Arbeitergruppe, SAG), which was founded in the 1970s by West German supporters of the British "International Socialists" (IS), precursor to the Socialist Workers Party (SWP). One of the founders of the SAG was Volkhard Mosler, who had been in contact with Tony Cliff since 1966. Initially based in Frankfurt, the SAG gradually developed a national structure but remained a relatively small organization. Like their British counterparts, the SAG sought to build a radical rank-and-file workers' movement to oppose moderate trade-union leaders.

After German reunification in 1990, the SAG participated in the emerging Antifa movement against the far right. In the early 1990s young members of the SAG joined Jusos, the Social Democratic Party's youth group, hoping to push its members to the left. After a short time began publishing the paper Linksruck, and by the end of 1993 the organization referred to itself by this name.

Dissidents in the group led by Norbert Nelte, critical of Linksruck's entryist tactics and the "lack of theoretical training for new members", broke off and formed the International Socialists (Internationale Sozialisten) in Cologne in 1992.

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