Today in History – April 30

1956 – Former Vice President and Democratic Senator Alben Barkley dies during a speech in Virginia.
1957 – Supplementary Convention on the Abolition of Slavery entered into force.
1961 – K-19, the first Soviet nuclear submarine equipped with nuclear missiles, is commissioned.
1963 – The Bristol Bus Boycott is held in Bristol to protest the Bristol Omnibus Company’s refusal to employ Black or Asian bus crews, drawing national attention to racial discrimination in the United Kingdom.
1966 – The Church of Satan is formed in The Black House, San Francisco.
1973 – Watergate scandal: U.S. President Richard Nixon announces that White House Counsel John Dean has been fired and that other top aides, most notably H. R. Haldeman and John Ehrlichman, have resigned.
1975 – Fall of Saigon: Communist forces gain control of Saigon. The Vietnam War formally ends with the unconditional surrender of South Vietnamese president Dương Văn Minh.
1980 – Beatrix is inaugurated as Queen of the Netherlands following the abdication of Juliana.
1980 – The Iranian Embassy siege begins in London.
1982 – The Bijon Setu massacre occurs in Calcutta, India.
1993 – CERN announces World Wide Web protocols will be free.
1994 – Formula One racing driver Roland Ratzenberger is killed in a crash during the qualifying session of the San Marino Grand Prix run at Autodromo Enzo e Dino Ferrari outside Imola, Italy.
2000 – Canonization of Faustina Kowalska in the presence of 200,000 people and the first Divine Mercy Sunday celebrated worldwide.
2004 – U.S. media release graphic photos of American soldiers abusing and sexually humiliating Iraqi prisoners at Abu Ghraib prison.