William Marshall Boyle Jr. (February 2, 1902 – August 30, 1961) was an American Democratic political activist from Kansas.
In 1944, Boyle joined the Democratic National Committee, where he helped steer Truman's 1944 Vice-presidential campaign.
In the 1948 campaign, he persuaded Truman, at the time an underdog, to launch a whistle stop tour of the Midwest.
However another Senate subcommittee opened a probe that revealed Boyle used his influence to obtain a $565,000 loan for an $8000 fee.
He attended Westport High School, where he soon organized a "Young Democrats Club" in the prosperous Fourth Ward of Kansas City.
[2] In 1944, Boyle helped manage Truman's successful run for Vice President on Franklin D. Roosevelt's ticket.
However, in 1951, he was implicated in an influence peddling scandal involving loans made by the Reconstruction Finance Corporation.
While a Senate investigation found no evidence of wrongdoing by Boyle, he resigned later that year due to "ill health".