The Revolutionary Union for Internationalist Solidarity (Greek: Επαναστατικός Σύνδεσμος Διεθνιστικής Αλληλεγγύης, abbreviated as ΕΣΔΑ), also known as RUIS is an anarchist military unit, part of the International Freedom Battalion involved in the Syrian Civil War. It was founded in 2015. In 2017, Greek authorities estimated the size of the group at five or six.[5]
In an interview to RUIS, obtained by the alternative portal Apatris.info in October 2015, a member of the group explains that the Revolutionary Union for Internationalist Solidarity "is an organization that fights for the world social revolution." The same interview reveals that their participants are anarcho-communists and anarchists from Greece. He suggests that in concert, the group aims at effective solidarity in the field of international armed conflicts. He also claims that they fight on the side of the oppressed classes for social liberation and "against the domination of States and Capital" denoting a radical anti-capitalist position. And he adds that "effective solidarity must have the characteristics of social struggle at all points of the conflict, breaking the limits of tyranny, oppression and exploitation."[8]
On 3 April 2017, the group reappeared on social networks on the occasion of a campaign of solidarity with the anarchist movement of Athens, launched through Twitter by the International Revolutionary People's Guerrilla Forces (IRPGF). This caught the attention of some Greek media, sending their messages even to State security and intelligence services which affirmed to the press their concerns about the return of the fighters to the country.[9][10][11][12]