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As Attorney General, he led multiple investigations of  [[communism|communist]] infiltration of [[Organized labor|trade union]]s attempting to organize themselves in Texas.<ref name="ladino 1996">{{cite book|author=Robyn Duff Ladino|title=Desegregating Texas Schools: Eisenhower, Shivers, and the Crisis at Mansfield High|date=1996|publisher=University of Texas Press|location=Austin, Texas|isbn=978-0292746923|pages=35–36|url=https://books.google.ca/books?id=3_I3r53r1VgC&pg=PA35#v=onepage&q&f=false}}</ref> Shepperd exposed a scheme to defraud Texas of  [[tobacco tax]]es.<ref name="state historical society" /> He also defended Texas from questions raised by other states regarding the Submerged Lands Act of 1953, a federal law which allocated revenues from the tidelands to Texas. In 1956, Shepperd was elected by his forty-seven peers as president of the National Association of Attorneys General.<ref name="state historical society" />​

As Attorney General, he led multiple investigations of  [[communism|communist]] infiltration of [[Organized labor|trade union]]s attempting to organize themselves in Texas.<ref name="ladino 1996">{{cite book|author=Robyn Duff Ladino|title=Desegregating Texas Schools: Eisenhower, Shivers, and the Crisis at Mansfield High|date=1996|publisher=University of Texas Press|location=Austin, Texas|isbn=978-0292746923|pages=35–36|url=https://books.google.ca/books?id=3_I3r53r1VgC&pg=PA35#v=onepage&q&f=false}}</ref> Shepperd exposed a scheme to defraud Texas of  [[tobacco tax]]es.<ref name="state historical society" /> He also defended Texas from questions raised by other states regarding the Submerged Lands Act of 1953, a federal law which allocated revenues from the tidelands to Texas. In 1956, Shepperd was elected by his forty-seven peers as president of the National Association of Attorneys General.<ref name="state historical society" />​

==Civic leadership==​

==Civic leadership==

After his tenure as attorney general, Shepperd moved to Odessa, where he was active not only in law but also in [[insurance]], [[banking]], petrochemicals, public relations, and historical preservation. He was a political adviser and personal friend of [[U.S. President]] [[Lyndon B. Johnson]]. In the middle 1960s, Shepperd was named trustee for the acquisition of land for the creation of Lyndon B. Johnson State Park and Historic Site along the Pedernales River in Gillespie County in the Texas Hill Country.<ref>{{cite web|url=http://www.nytimes.com/1990/03/10/obituaries/john-ben-shepperd-ex-texas-official-74.html|title=​

After his tenure as attorney general, Shepperd moved to Odessa, where he was active not only in law but also in [[insurance]], [[banking]], petrochemicals, public relations, and historical preservation. He was a political adviser and personal friend of [[U.S. President]] [[Lyndon B. Johnson]]. In the middle 1960s, Shepperd was named trustee for the acquisition of land for the creation of Lyndon B. Johnson State Park and Historic Site along the Pedernales River in Gillespie County in the Texas Hill Country.<ref>{{cite web|url=http://www.nytimes.com/1990/03/10/obituaries/john-ben-shepperd-ex-texas-official-74.html|title=​

John Ben Shepperd, ex-Texas official, 74|publisher=''[[The New York Times]]''|date=March 10, 1990|accessdate=July 21, 2009}}</ref>​

John Ben Shepperd, ex-Texas official, 74|publisher=''[[The New York Times]]''|date=March 10, 1990|accessdate=July 21, 2009}}</ref>​