May 24. 1921: Beginning of trial of Sacco and Vanzetti, anarchist labor organizers, in Massachusetts. Their execution was the culmination of a five-year government campaign to crush political dissidents (particularly socialist and anarchist workers) in the US.

May 25. 1807: Slave trade in the United States of America is abolished. 1948: Garry Davis, an ex-US GI, renounces US citizenship to become Citizen of the World. Davis continues to promote "world citizenship" for over 50 years; 400,000 have, at one time or another, joined the movement.

May 26. 1868: Pres. Andrew Johnson avoids impeachment by one vote. 1991: Twenty thousand in Arab-Jewish peace rally, Tel Aviv, Israel.

May 27. 1871: End of the Paris Commune (Bloody Week). Desperate combat by the Communards ends up even in Pere Lachaise cemetery. The Communards will be lined up and shot against the wall. 1956: Tallahassee (Fla.) bus boycott. 1975: Alaska legalizes home use of marijuana.

May 28. 861: Paris is again burned by the Vikings. A fine tradition. 1871: Paris Commune crushed by French soldiers; 25,000 massacred. 1970: Police arrest 40 anti-Nixon protesters for "disrupting a religious service" during a Billy Graham crusade in Tennessee.

May 29. 1990: US Supreme Court rules Indian tribes do not possess the authority to exercise criminal jurisdiction over anyone other than tribal members on their reservations.

May 30. 1431: French military leader Joan of Arc burned at the stake. 1990: Midnight Oil closes down Sixth Avenue in New York City as they play a protest concert in front of Exxon's offices in reaction to the Exxon Valdez disaster.

May 31. 1678: Tax protester Lady Godiva rides naked through Coventry. 1889: Johnstown Flood. 2,200 hundred people die as the South Fork Dam, long in a state of disrepair, finally broke, unleashing a 30-foot wall of water on the city of Johnstown, Pennsylvania.

June 1. 1963: US Supreme Court bans formal prayers and religious exercises from public schools. 1964: US Supreme Court strikes down a Washington state law requiring loyalty oaths for state employees.

June 2. 1899: Butch Cassidy's "Hole in the Wall Gang" robs Union Pacific train in Wyoming.

June 3. 1918: US Supreme Court declares newly passed child labor law unconstitutional; a similar law, passed by Congress the following year, would also be declared unconstitutional before the third one stuck. 1957: Linus Pauling and 2,000 other scientists join call for ban on nuclear weapons testing. Eisenhower rejects plea.

June 4. 1789: US Constitution goes into effect. 1951: US Supreme Court upholds conviction of 11 leaders of the US Communist Party on charges of conspiring to advocate the violent overthrow of the US government.

June 5. 8239 B.C.: Presumed origin of Mayan Era of Creation. 1967: Boxer Muhammed Ali is sentenced to five years in prison for refusing the military draft.

June 6. 1968: Comedian Dick Gregory begins hunger strike in Olympia, Wash. jail after his arrest in support of Nisqually tribal fishing rights.