With no explanation, label each line with "person-politician", "O", "event-protest", "other-law", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting" or "art-writtenart" preceded by ":".
Initially
embracing
the
Bolshevik
revolution
as
a
liberating
event
and
participating
in
the
effort
to
create
a
new
proletarian
culture
,
following
the
New
Economic
Policy
he
became
disillusioned
and
was
imprisoned
during
the
Joseph
Stalin
era
.
Initially:O
embracing:O
the:O
Bolshevik:event-protest
revolution:event-protest
as:O
a:O
liberating:O
event:O
and:O
participating:O
in:O
the:O
effort:O
to:O
create:O
a:O
new:O
proletarian:O
culture:O
,:O
following:O
the:O
New:other-law
Economic:other-law
Policy:other-law
he:O
became:O
disillusioned:O
and:O
was:O
imprisoned:O
during:O
the:O
Joseph:person-politician
Stalin:person-politician
era:O
.:O