In 1907 the Board was given the power to approve or disapprove parole for prisoners recommended by the governor.
In 1913 the governor was given the power to appoint the warden, and the Board was given jurisdiction over persons receiving suspended sentences.
The commissioners had "full and exclusive control over all the territorial prison grounds, buildings, prisoners, prison labor, prison property and all other things belonging or pertaining to said prison," and established "rules, regulations and by-laws" to govern the prison. An 1893 law removed prisoners from the commissioners' control, empowered the Board to appoint the warden, and established the Board as consisting of the governor, the secretary of state, and the attorney general, with two members constituting a quorum.
Prison work crews built roads in western Montana and constructed buildings at the Montana State Hospital for the Insane and the Montana State Tuberculosis Sanitarium, as well as making many improvements to the prison itself.
In 1921 Governor Joseph Dixon initiated an investigation of Conley's alleged use of state monies for personal gain; this investigation led to Conley's dismissal.
In 1955 the Board membership was changed to three members appointed by the governor to terms of six years. Barry, James Barry, Jerry Barry, Michael Barry, William Barry, William C. Beckman, Thomas Beckwith, Jerry Bedard, Omer Beebout, William Beech, Charles Beecham, Harry Beeler, Howard Beeson, Daniel Beeton, Bernard Beghtol, Frederick Behkla, Kee Bejay, Elmer Bekola, Charles Belcher, Levi Belcourt, Ed Belgard, Frank Belgard, Tom Belgard, Victor Belgard, Corbett Belgarde, Harold Belgarde, James Belgarde Prisoner description cards: John Belgarde, Mae Belgarde, Steven Belgarde, Victor Belgarde, William Belgarde, Pat Belgrade, Rayley Belich, Tony Belish, Paul Beliveau, Albert Belim, Lee Belknap, Bert Bell, Charles Bell, George Bell, Glenn Bell, Henry Bell, James Bell, Jon Bell, Kip Bell, Wilfred Bell, Emmerson Bellamy, Virgil Belleau, Joseph Belliz, Pete Bellonzja (Marion Wollums), Leon Bellows, Thomas Belt, Martin Belter, Enrique Beltran, Santos Beltran, Robert Melton Belyea, Tony Bender, Jacob Bengart, Robert Benge, Harry Benham, Mack Benham Prisoner description cards: Theo Benike, Rose Benjami, Frank Benka, Charles Bennett, Edward Bennett, Emil Bennett, George Bennett, Ivan Bennett, Jack Bennett, James Bennett, Jim Bennett, Reule Bennett, Thomas Bennett, T. Bennett, Vaughn Bennett, Jack Benninghoven, Frank Bennon, James Benoit, James Benson, Ed Benny, W. Benny, William Benston, Allen Benton, Thomas Benton, John Benz, Louis Bercie, Alex Bercier, Simeon Bercier, Adam Berck, Albert Berg, Andrew Berg, Bennie Berg, George Berg, Julius Berg, Pete Berg, Robert Berg, William Berg, Walter Berg, Andrew Berger (Anthony Newberger), Byron Berger, Charles Berger (William Stevens), Felix Berger, Joe Berger, Loren Berger, Pat Berger Prisoner description cards: Harold Bergerud, Bert Berglund, Henry Bergman, William Bergman, Frank Bergmoser, F.
The appointees were given the responsibility of administering the executive clemency, probation, and parole system. Barry, Jack Barth, John Bartholomeu, Martin (William) Bartinoscke, Cal Bartlett, Charles Bartlett [2 different ones], George Bartley, Willie Bartley, Charles Barton, Frank Barton, W. Barton, Champion Bartron, Lloyd Woodrow Bartu, Robert Bartz, John Bartzen [Bartsen?