FDR enacted the Fairness Doctrine in 1934.
It was adopted as an FCC rule in 1949, see FCC, Report on Editorializing by Broadcast Licensees, 1949. The legislation referenced in the polemical article you linked to was the creation of the Communications Act which created the FCC. The article is misleading at best, more fairly its an outright lie. The creation of the FCC no more created the Fairness Doctrine than the requirements of the Republican enacted Federal Radio Commission’s 1928 requirement that licensees show...“due regard for the opinions of others.” did or the later prohibition of editorializing of any kind on the radio (which didn’t last long).