Williams attempted to remain president of the Teamsters, however. He was sentenced to 55 years in prison on March 31, 1983. He offered to testify in various trials of organized crime figures, which federal prosecutors accepted. Williams remained free on bail while he was deposed. But Congress, hearing more and more testimony about the degree of criminal infiltration of the Teamsters, pressed him to step down. Williams eventually resigned on April 14, 1983, and Teamsters international vice president Jackie Presser assumed the presidency. A large collection of documents that were produced during Williams's tenure as Teamsters president are now preserved in the Special Collections Research Center of The George Washington University, located in the Estelle and Melvin Gelman Library.