10,000 Attend Fiery Denunciation of America---Red Campaign Extends PARIS, Oct 21 (By A. P.)—Seven policemen were injured tonight, by the explosion of a bomb thrown into a crowd in Wagramay during a s meeting held by the French Com munist party in protest against the conviction for murder in Massachu setts of the Italians Sacco and Van. pet. ‘Several manifestants also were hurt, and six persons were arrested, charged with disorderly conduct. The meeting was advertised as a protest against the American Gov ernment, capitalists and the cone ton of Sacco and Vansett. The speakers bitterly denounced the United States Government and Amery capacity of the hall was reached there was a large overflow of bell cote demonstrators outside. It had been announced as the intention to march to the American Embassy. Continued on the Fourth Pane.