July 29, 1900 – King Umberto of Italy was assassinated by Italian anarchist Gaetano Bresci, as revenge for the army's crushing of the worker's insurrection in Milan, May 1898, in which they killed hundreds of workers. Bresci was arrested and later found strangled in his cell at Santo Stefano Prison, on May 22nd, 1901.
July 29, 1903 – The first delegation from Mother Jones’ March of the Mill Children arrived at Teddy Roosevelt's summer home in Oyster Bay, Long Island, to publicize the harsh conditions of child labor. They weren’t allowed through the gates. (From the Daily Bleed)
July 29, 1970 – After five years on strike, the United Farm Workers finally won a contract with California grape growers. (From Workday Minnesota)