denial of clemency to Sacco and Vanzetti, bombs exploded at two subway stations on New York City's 28th Street, seriously injuring two people and hurting many others. The threat of violent protests put police on alert worldwide. Saturday, August 6, 1927 Harold Stephen Black invented the negative feedback amplifier. Four days earlier, he had come up with the idea while riding the Lackawanna Ferry across the Hudson River to his New York job. The forerunner of the breathalyzer was first demonstrated by Professor Rolla H. Harger of Indiana University, who showed how breath contained in a balloon could be dispersed into sulfuric acid and then accurately measured to calculate blood alcohol content. Harger would patent the "Drunkometer" in 1938 for use by police.<ref>"Rolla N. Harger Dies; Invented Drunkometer", New York Times, August 9, 1983</ref> Born: Richard Murphy, Irish poet, in County Mayo (d. 2018) Sunday, August 7, 1927 At an emergency meeting of the Chinese Communist Party, convened in Hankou by the Vissarion Lominadze Soviet representative of Comintern, Secretary General Chen Duxiu (Ch'en Tu-hsiu) was deposed as the CCP's leader, and replaced by Qu Qiubai (Ch'u Ch'iu-pai). At the meeting, future Party Chairman Mao Zedong made the oft-quoted statement that "political power is obtained out of the barrel of a gun". The Peace Bridge opened between Fort Erie, Ontario, and Buffalo, New York, as British Prime Minister Stanley Baldwin, Edward, Prince of Wales, U.S. Vice President Charles G. Dawes, U.S. Secretary of State Frank B. Kellogg, and New York Governor Al Smith, met at the center of the span. Mrs. Dawes, and Mrs. W.D. Ross, wife of the Deputy Premier of Ontario, cut the ribbon with golden shears. Trofim Lysenko, whose discredited ideas about genetics would dominate Soviet thought during the era of Joseph Stalin, first came to national attention in the Soviet Union as the subject of a feature story in Pravda. Born: Carl "Alfalfa" Switzer, American actor and singer in the Little Rascals comedies (killed, 1959) Edwin Edwards, three-time Governor of Louisiana between 1972 and 1996, who was later convicted of racketeering; in Marksville, Louisiana (d. 2021) George Busbee, Governor of Georgia 1975–83, in Vienna, Georgia (d. 2004) Died: Pope Cyril V of Alexandria, 96, Patriarch of the Coptic Christian Church since 1874 U.S. Army Major General Leonard Wood, Governor-General of the Philippines, 66 Arthur T. Walker, 49, multimillionaire who had inherited most of the estate of Edward