mob ransacked Ruthenberg's headquarters. Mounted police, army trucks, and tanks restored order. Two people died, forty were injured, and 116 arrested. Local newspapers noted that only 8 of those arrested were born in the United States. The city government immediately passed laws to restrict parades and the display of red flags. With few dissents, newspapers blamed the May Day marchers for provoking the nationalists' response. The Salt Lake City Tribune did not think anyone had a right to march. It said: "Free speech has been carried to the point where it is an unrestrained menace." A few, however, thought the marches were harmless and that the marchers' enthusiasm would die down on its own if they were left unmolested. Race riots More than two dozen American communities, mostly urban areas or industrial centers, saw racial violence in the summer and early fall of 1919. Unlike earlier race riots in U.S. history, the 1919 riots were among the first in which blacks responded with resistance to the white attacks. Martial law was imposed in Charleston, South Carolina, where men of the U.S. Navy led a race riot on May 10. Five white men and eighteen black men were injured in the riot. A Naval investigation found that four U.S. sailors and one civilian—all white men—were responsible for the outbreak of violence. On July 3, the 10th U.S. Cavalry, a segregated African-American unit founded in 1866, was attacked by local police in Bisbee, Arizona. Two of the most violent episodes occurred in Washington, D.C. and Chicago. In Washington, D.C., white men, many in military uniforms, responded to the rumored arrest of a black man for rape with four days of mob violence, rioting and beatings of random black people on the street. When police refused to intervene, the black population fought back. When the violence ended, ten whites were dead, including two police officers, and 5 blacks. Some 150 people had been the victims of attacks. The rioting in Chicago started on July 27. Chicago's beaches along Lake Michigan were segregated in practice, if not by law. A black youth who drifted into the area customarily reserved for whites was stoned and drowned. Blacks responded violently when the police refused to take action. Violence between mobs and gangs lasted 13 days. The resulting 38 fatalities included 23 blacks and 15 whites. Injuries numbered 537 injured, and 1,000 black families were left homeless.