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Hi James -- thanks for posting in History Hub!
The personal papers of former Congressmen are not held by the Center for Legislative Archives. Instead, personal papers are geographically dispersed in repositories around the country.
For more background, the Office of History, Art & Archives of the House has written a post on the personal papers of members of Congress. Likewise, you can read more about Senators' papers and archives.
The website bioguide.congress.gov is the best source for identifying where these archival collections are located. In addition to a brief biography, each entry contains a list of repositories where a particular member's papers are housed.
It looks like there's only a small collection noted for James A. Gallivan. Given that, it may be worthwhile to check if there are Gallivan papers in archival repositories not listed in the bioguide, such as the Massachusetts State Archives, the Boston City Archives, the Massachusetts Historical Society, the Library of Congress and the archives at his alma mater, Harvard University.
Hopefully this helps!