 On June 12, 1966, Puerto Ricans celebrated the culmination of this week, and their first ethnic parade in downtown Chicago, held on June 11.In the evening, on Division Street in West Town and Humboldt Park, an altercation began between police and revelers near Damen Avenue and Division Street.Police alleged that Arcelis Cruz, a young Puerto Rican man, was armed and involved in a street fight.