In Paris in 1938, Schüssler participated at the founding of the Fourth International.
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After the Stalinists killed Trotsky in a second attempt on August 20, Schüssler remained in Mexico, took a job, and continued to be active in the Mexican section of the Fourth International under his Mexican pseudonym, "Julián Suárez."
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He arrived in Coyoacán in February 1939 and started working as Trotsky's secretary and bodyguard.
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