Che Guevara INternational Brigade

[B_T_N_H]

I was reading through JLA book and I found a page in which the Name of a group Che Guevara International Brigade. Can anyone tell me about who they are what they did and where they are from,..

Are they related to the Sinn Fein or the Baader Meinhof ?

Bealfan aka Ak-94u