With no explanation, label each line with "location-GPE", "O", "organization-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
By
1572
,
the
Oprichnik
had
become
a
destabilizing
force
and
were
disbanded
by
Ivan
,
especially
as
he
blamed
them
for
the
lack
of
response
to
the
Tartar
sack
of
Moscow
in
1571
.
By:O
1572:O
,:O
the:O
Oprichnik:organization-other
had:O
become:O
a:O
destabilizing:O
force:O
and:O
were:O
disbanded:O
by:O
Ivan:O
,:O
especially:O
as:O
he:O
blamed:O
them:O
for:O
the:O
lack:O
of:O
response:O
to:O
the:O
Tartar:O
sack:O
of:O
Moscow:location-GPE
in:O
1571:O
.:O