Alternative Left (Spanish language: Izquierda Alternativa, IA) was a Spanish political party with a socialist ideology formed by the union of the Revolutionary Communist League (LCR) and the Communist Movement (MC) in 1991.
The merger in 1989 of the respective territorial organizations of the MC and the LCR in the Basque Country; Euskadiko Mugimendu Komunista (EMK) and Liga Komunista Iraultzailea (LKI), as Batzarre in Navarre and Zutik in the Basque Autonomous Community, led to calls for a rethinking of the new conditions for unity between the two parties.
Finally, an agreed was reached in March 1991 to the unification of the two groups, which was made effective in November 1991.
The MC sector planned to evolve to a "non-political party" social collective, that would push for society self-organization, while the LCR defended a classic political party project.
Finally, Alternative Left split into two nationwide: the LCR group stayed with the name, later to integrate with Jaime Pastor as their main leader, in the United Left in November 1993 (though in the process of infighting the organization lost up to a third of its membership) and the MC group stayed with the name of some of the territorial organizations of IA.