Acrowd of about 20,000 people demonstrated in 1905 in st. petersburg to appeal . this demonstration led to .
the first blank : the freedom of serfs/ workers' reforms/ the appointment of a new czar
the second blank: bloody sunday/ the decembrist recolt/ the crimean was

A crowd of about 20,000 people demonstrated in 1905 in St. Petersburg to appeal for Workers' reforms . This demonstration led to Bloody Sunday .

This excerpt is about the Russian Revolution of 1905. It was a series of events that led to a Constitutional Reform.

The manifestation the excerpt mentions happened during a strike. Workers left their workplace to deliver a petition to the Tsar, in front of the palace. At a certain point, the guards opened fire, which caused between 200 and 1000 deaths.