<P> Widely publicized activities continued in the ensuing months . When Dr. King was arrested, he sent a "Letter from the St. Augustine Jail" to a northern supporter, Rabbi Israel Dresner . This resulted, a week later, in the largest mass arrest of rabbis in American history--while conducting a pray - in at the Monson . A well - known photograph taken in St. Augustine shows the manager of the Monson Motel pouring muriatic acid in the swimming pool while blacks and whites are swimming in it . The horrifying photograph was run on the front page of the Washington newspaper the day the Senate went to vote on passing the Civil Rights Act of 1964 . </P> <P> In the summer of 1964, COFO brought nearly 1,000 activists to Mississippi--most of them white college students--to join with local black activists to register voters, teach in "Freedom Schools," and organize the Mississippi Freedom Democratic Party (MFDP). </P> <P> Many of Mississippi's white residents deeply resented the outsiders and attempts to change their society . State and local governments, police, the White Citizens' Council and the Ku Klux Klan used arrests, beatings, arson, murder, spying, firing, evictions, and other forms of intimidation and harassment to oppose the project and prevent blacks from registering to vote or achieving social equality . </P> <P> On June 21, 1964, three civil rights workers disappeared: James Chaney, a young black Mississippian and plasterer's apprentice; and two Jewish activists, Andrew Goodman, a Queens College anthropology student; and Michael Schwerner, a CORE organizer from Manhattan's Lower East Side, were found weeks later, murdered by conspirators who turned out to be local members of the Klan, some of them members of the Neshoba County sheriff's department . This outraged the public, leading the U.S. Justice Department along with the FBI (the latter which had previously avoided dealing with the issue of segregation and persecution of blacks) to take action . The outrage over these murders helped lead to the passage of the Civil Rights Act . </P>

When did the civil rights movement start and end