He participated in the Spanish Civil War and was a member of the Communist Party.

Entity and relation annotations:
id: 0
type: entity
value: text: the Spanish Civil War
labels: <Event>
id: 1
type: entity
value: text: the Communist Party
labels: <Organization>
id: 2
type: entity
value: text: member
labels: <Title>
type: relation
to_id: 2
labels: Organization:Establishes:Title
from_id: 1