Although the Civil Rights Act of July 2, 1964 forbade all discrimination on the basis of race, in 1965 police brutality towards a black man during a traffic stop resulted in a major riot among the black community in the Watts neighborhood of Los Angeles, the government's response to which is considered by many to have been a failure. Indeed, every summer from 1964 through 1970 was a "long hot summer", though 1967 is particularly called that since 159 riots occurred that year. Additionally, after the April 4, 1968 murder of Martin Luther King, a new wave of riots broke out in over 100 cities, with nights of violence against police and looting and burning of local white-owned businesses. The inner neighborhoods of many major cities, such as Detroit, Los Angeles, Newark and New York, were burned out. National Guard and Army troops were called out. At one point machine gun units were stationed on the steps of the Capitol building in Washington to prevent rioters from burning it down.