Between 1904 and 1919, Löbe was in the Breslau city council and, from 1915 to 1920, a member of the provincial parliament () of
Silesia. During the
German Revolution of 1918–1919, Löbe declined to join the
Council of the People's Deputies, the interim body under
Friedrich Ebert (SPD) that led the country during the turbulent post-war months, because he felt himself "not yet sufficiently prepared for such a task". In the
election of January 1919, the first in Germany with full suffrage for both women and men, Löbe was elected to the
Weimar National Assembly, the parliamentary group that wrote the
constitution of the Weimar Republic and served as Germany's interim Reichstag. In June 1919, he became one of the assembly's vice presidents. He was a member of the Reichstag from its first Weimar Republic sitting in 1920 until 1933. In 1921, he also became a member of the
Prussian State Council (). From 1920 to 1924 (1st electoral period) and from 1925 to 1932 (3rd-5th electoral periods), he was president of the Reichstag, a position that was responsible for maintaining and organizing the Reichstag's self-government. In 1919 and 1920, he made efforts to reach an understanding with the moderate wing of the
Independent Social Democratic Party (USPD), the antiwar and more left-leaning wing of the SPD that had broken away in 1917; it rejoined the SPD in 1922. After Ebert died in 1925, Löbe declined his party's offer to run as the SPD candidate in the
presidential election against the conservative
Paul von Hindenburg, who won in the second round. Löbe saw his place to be in the parliament. From 1932 to 1933 (7th electoral period), he was the Reichstag vice president. In his function as Reichstag president, especially after October 1930, Löbe more and more often faced disturbances during Reichstag sessions, most of them coming from the
Nazis and the
Communist Party (KPD). Löbe met the challenge with a mixture of patience and severity in enforcing order against individual deputies. On behalf of the SPD, he spoke out in favor of an accommodation with Poland. In 1927, he went to
Warsaw and
Lodz for talks with Polish politicians. He told them that the two countries should no longer fight each other politically but should cooperate economically. He suggested negotiations on disputed border issues in return for which the German Reich could offer trade agreements. In Lodz, however, where Löbe had been invited to an anniversary celebration of the local Social Democrats, Polish nationalists demonstrated against his visit. Nor did the men from the Warsaw leadership with whom he had talked respond to his proposals. After the trip, he complained about a lack of willingness to compromise on the Polish side. As radio technology advanced, the question of the extent to which Reichstag sessions should be broadcast on the radio arose more and more often. In his radio address of 12 June 1930, Löbe advocated a time-delayed "occasional transmission of particularly important sessions" in which all party speakers would appear for roughly the same length of time, but the majority of the Reichstag's Council of Elders, a body that dealt with points of order, opposed it. During the Weimar period, Löbe was also active in numerous organizations outside parliament. From 1921 to 1933, he was chairman of the Austro-German People's League, which advocated the unification of Austria with the German Reich. He was involved with politicians such as French Prime Minister
Aristide Briand, the Czech leader
Edvard Beneš, the Austrian
Ignaz Seipel and the future chancellor of
West Germany Konrad Adenauer in the
Paneuropean Union, founded in 1922. For a time, Löbe was president of its German branch. He was a member of the
Reichsbanner Schwarz-Rot-Gold (Reich banner black-red-gold), a multi-party organization formed in 1924 to defend parliamentary democracy in the Weimar Republic. In 1932 and 1933, he was editor of the SPD's newspaper
Vorwärts. == World War II to death ==