Revolutionary Union for Internationalist Solidarity

The Revolutionary Union for Internationalist Solidarity (, abbreviated as ΕΣΔΑ), also known as RUIS is an anarchist military unit part of the International Liberation Brigade involved in the Syrian Civil War. It was founded in 2015 and is composed mostly of Greek volunteers.

Their appearance has alarmed Greek security and intelligence officials alleging that "warriors will be trained in guerilla warfare and then will be able to apply what they have learned in their homeland".

History
The group launched a statement through Indymedia announcing its founding, the statement was dated April 2015. In that statement the organization claims that they are Greek internationalist anarchists who come to Rojava in response to the call for volunteers by MLKP made in January, to form an internationalist brigade to defend the Rojava Revolution, along with the YPG and YPJ, against the Islamic State of Iraq and the Levant. They are one of the first former members of the International Freedom Battalion with MLKP, the United Freedom Forces, TIKKO and the Spanish Reconstrucción Comunista.

In an interview to RUIS, obtained by the alternative portal Apatris.info in January 2016, a member of the group explains that the Revolutionary Union for Internationalist Solidarity "is an organization that fights for the world social revolution." In the same reveals that their participants are anarcho-communist 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."

On 3 April 2017, the group reappears on social networks on the occasion of a campaign of solidarity with the anarchist movement of Athens, launched through Twitter by the IRPGF. The fact caught the attention of different Greek media, arriving their messages even to the services of security and intelligence of the State which affirmed to the press their worries regarding the return of the fighters to the country.

Ideology
The group is based on the ideals of anarcho-communism, also called libertarian communism, a philosophical and economic major trend within anarchism whose main exponents were Carlo Cafiero, Piotr Kropotkin, Errico Malatesta and Nestor Makhno among others. The group could also be classified as especifist. In spite of being an organization of especifist tendency advocates for the Left unity and the coexistence with the different proletarian movements like the Marxism-Leninism.

RUIS was the first anarchist unit to join the International Freedom Battalion, succeeded by the IRPGF, but previously to the latter, the Turkish vegan anarchist unit Sosyal Isyan (Social Rebellion) part of the United Freedom Forces.