Tsvetaeva does not seem to have known that her husband was a spy , nor the extent to which he was compromised .
Later it was learned that Efron possibly had also taken part in the assassination of Trotsky 's son in 1936 .
Tsvetaeva does not seem to have known that her husband was a spy , nor the extent to which Efron was compromised .
Later it was learned that Efron possibly had also taken part in the assassination of Trotsky 's son in 1936 .