Did Debord ever join Socialisme ou Barbarie group?
Yes, briefly
No
Yes, for a long time
Unconfirmed
Answer
Yes, albeit briefly, Debord was part of Socialisme ou Barbarie. He was a primary instigator in the formation of the Lettrist group, but by 1952 he joined forces with the Socialisme ou Barbarie group, before parting ways within the year.
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