Kiedroń worked as a director of two coal mines in Dąbrowa and was active in trade unions as well as in the Polish cultural and educational organizations.

On 1 August 1905 he married Zofia Kirkor-Kiedroniowa, Polish activist and sister of noted politicians Stanisław and Władysław Grabski.

Together with his wife he cooperated with Polskie Zjednoczenie Narodowe (Polish National Unity) political organization in Cieszyn Silesia of right-wing character.

In 1920, Cieszyn Silesia was divided between Poland and Czechoslovakia by the decision of Spa Conference, in which Kiedroń was present as a Polish delegate.

His hometown and the workplace fell to Czechoslovakia and Kiedroń left the Trans-Olza area, as he was an active pro-Polish activist; and stayed in Poland, where worked in Upper Silesia and Warsaw.