Who said "The pen is mightier than all the weapons of forgetting."?

This quote is attributed to Rodolfo Walsh.

The pen is mightier than all the weapons of forgetting. - Rodolfo Walsh

"The pen is mightier than all the weapons of forgetting."

Rodolfo Walsh Art

Novelist Journalist Argentine 1927–1977

"Journalism is the first draft of history"

"To know is to act"

"The truth is like a lion; you don't have to defend it. Let it loose; it will defend itself"

"Words are the only bullets that pierce the heart without leaving a mark"

"The stage is my true home."

"Art is the expression of the soul."

"Living well means living properly."

"Art and music are the treasures of civilization"