BLACK HAM) EXPLOSIOX.Ilarbrr Shop HI awn In by Would-He Illaak-■nailers One .Han Arrcalcd.A bomb was exploded in front of the barter shop of Ca^siiniro- Liotta ut 813 Hushing avenue, Williamsburg, early yesterday morning. It wrought cons idem hie damage and stunned thefburler, hia wife and three HinaJl children, who were sleeping in reur rooms. Five minutes before the explosion Folicdaiar. Drum of the Stagg street station paused the shop and tried tne door. Meanwhile the thirty occupants of the two upper floors had been aroueed. Horses harnessed to wagons belonging to the lt;iairy opposite became frightened and ran awuy All were caught. The explosion was followed by a fire in the barber shop, which the police quickly extinguished. The concussion shuttered window** of nearby dwellings and the chandeliers in the sgloon of Valentine Young. Liotta and his two brothers had for more than u vear received threatening letters from tne Black Hand Society. Tne brothera are also iar-bers, one in (Ireenpoint and the other in Flushing avenue near CassimiTO’s place. In each letter a demand of from $200 to $1,500 was made. Liotta turned over the letters to Police Captain Hayes of the Stags street station who put Detectives Kelly and Pendle on the case. In Liotta'h shop the police found pieces of wire and blue paper which the bomb had evidently contained. On information received later the two detectives arrested Vivita Cologtiro, 67 years old, a saloon keeper at 165 Klizabeth street. Manhattan.