Apr. 13. 1919: Socialist, pacifist, and labor leader Eugene Debs imprisoned for opposing US entry into World War I. 1919: Massacre of Armitsar: British troops open fire on demonstrators, Armitsar, India, killing an estimated 379 and injuring 1200.

Apr. 14. 1919: Seattle longshoremen begin 34-day strike. 1964: American ecology writer Rachel Carson dies at age 57, only two years after publishing her groundbreaking work "Silent Spring." Silver Spring, Maryland.

Apr. 15. 1986: US bombs five "terrorist" locations in Tripoli and Benghazi, Libya, killing numerous civilians, in retaliation for "confirmed" Libyan links to a terrorist bombing of US soldiers at a disco in West Germany. The daughter of Libyan leader Col. Qaddafi is assassinated in the attack; the disco bombing is later proven not to be the work of Libya.

Apr. 16. 1291: The more things change, the more they stay the same: Rudolph Hapsburg purchases the rights to govern Lucerne, Switzerland.

Apr. 17. 1961: US uses covert mercenaries to invade Cuba in the abortive Bay of Pigs fiasco. Invasion ends quickly in disarray and ignomy for the US, which initially denies responsibility.

Apr. 18. 1970: Four thousand march in Seattle for peace in Southeast Asia, escorted by Seattle police officers with daffodils tied to their night sticks. 1998: Labor organizations from across Latin America converge on Santiago, Chile, in a mass protest of Bill Clinton's free trade visit and Free Trade Area of the Americas negotiations there.

Apr. 19. 1993: Federal agents attack Branch Davidian compound near Waco, Texas; incinerating about 80 members. Later revelations suggest government munitions started the deadly fire and that agents prevented compound residents from fleeing the burning building.

Apr. 20. 1953: US House of Representatives repeals ban on selling guns and ammunition to Native Americans. 1985: Some 250,000 march in Washington to protest US policy in Central America. 2002: More than 75,000 march in Washington to protest War on Terror.

Apr. 21. 1972: Protesters in El Paso, Texas, pelt Gen. Westmoreland with tomatoes. 2001: Sixty thousand or more dance, shout, and battle police on the streets of Quebec City, where 34 Western Hemisphere heads of state gathered to negotiate the NAFTA-style Free Trade Area of the Americas.

Apr. 22. 1970: An estimated 20 million participate in anti-pollution demonstrations across the US to mark the first Earth Day. Corporate sponsorships were notably absent.

Apr. 23. 1992: Ten thousand Indians march for recognition and reform, Quito, Ecuador.

Apr. 24. 1971: Largest ever (over 1,000,000) demonstration opposing US war in Southeast Asia, Washington DC. 150,000 march at a simultaneous rally in San Francisco.

Apr. 25. 1974: "Carnation Revolution" ends 48-year military dictatorship, Portugal. 1983: One hundred seventy-five women arrested for marching to mourn the rape of women in war, Sydney and Melbourne, Australia.

Apr. 26. 1953: Radioactive rain falls on Troy, New York. 1986: Worst known nuclear disaster in history occurs at Chernobyl, USSR (now Ukraine). Explosion kills at least 200 and irradiates much of Eastern Europe and Scandinavia. Subsequent death toll from radiation exposure is now estimated in the hundreds of thousands.