On the night of April NUMBER@1 , the Cheka -LRB- MISC@1 secret police -RRB- raided a building occupied by the LOCATION@1 , with the official aim of arresting and charging `` robber bands '' in the anarchist ranks .

On the night of April NUMBER@1 , NUMBER@2 the LOCATION@2 , the secret police , attacked the building of the LOCATION@1 , and the ORGANIZATION@1 offered armed resistance .
