<p>The Humboldt Park and Puerto Rican communities gathered Thursday afternoon to unveil honorary street signs recognizing Rafael Cruz and Julio Osorio, two Puerto Rican men whose deaths in 1977 became a catalyst for change.</p><p>Cruz and Osorio were shot and killed by a Chicago policeman in June 1977 during violence that broke out in Humboldt Park after the Puerto Rican Day Parade. Police blamed gangs; some in the community accused officers of storming the park and beating picnickers. It's become known as the "Humboldt Park Riots."</p><p>The tragic deaths of the two men on a day that began as a celebration of Puerto Rican heritage fueled demands for justice and sparked decades of activism within the neighborhood and Puerto Rican community.