In January 1917, the Watch Tower Society's legal representative, Joseph Franklin Rutherford, was elected as its next president. His election was disputed, and members of the Board of Directors accused him of acting in an autocratic and secretive manner. The divisions between his supporters and opponents triggered a major turnover of members over the next decade. In June 1917, he released The Finished Mystery as a seventh volume of Russell's Studies in the Scriptures series. The book, published as the posthumous work of Russell, was a compilation of his commentaries on the Bible books of Ezekiel and Revelation, plus numerous additions by Bible Students Clayton Woodworth and George Fisher. It strongly criticized Catholic and Protestant clergy and Christian involvement in the Great War. As a result, Watch Tower Society directors were jailed for sedition under the Espionage Act in 1918 and members were subjected to mob violence; charges against the directors were dropped in 1920.
In what year did Joseph Franklin Rutherford become the legal representative of the Watch Tower Society?