Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Mann Elkins Act was a 1910 United States federal law that is among the Progressive era reforms. The Act extended the authority of the Interstate Commerce Commission to regulate the telecommunications industry, and designated telephone, telegraph and wireless companies as common carriers. Supported by President William Howard Taft, the law also expanded on the powers granted to the ICC in the 1906 Hepburn Act. The ICC was authorized to investigate proposed railroad rate increases and suspend them if warranted.