Dahl was an eminent figure in Swedish political life, serving as a Social Democratic member of the Riksdag (parliament) for several years.
In the 1930s, Sweden, as elsewhere, had high unemployment, and the Swedish Social Democratic Party was regularly attacked by both Communist and Nazi sympathizers. In February 1932, for example, Swedish unemployment stood at 108,000 and no regular national unemployment insurance system had yet been established. At Uddevalla's annual May Day demonstration in Kungstorget-Folkets Park that year, municipal workers union chair Axel V. Johansson had addressed the crowd of 2,500. In the lull before the main speaker, Axel Lindqvist, M.P., arrived, Einar Dahl, then still a young elementary school teacher, gave an impromptu speech warning young people against the superficial proposals of extremists, declaring that only with deep reflection and earnestness could they build a brighter future.
From 1933 until 1977, Dahl served as secretary of the Gustafsberg Foundation, which operated a boarding school for secondary students in Uddevalla. He took a keen interest in helping students from Uddevalla and Lysekil qualify for admission to the new University of Gothenburg after it opened in 1954.
In 1944, the Gerlesborg School of Fine Art began operating a summer school for the arts in a boarding house in Gerlesborg. The school offered cultural programs including chamber music evenings and art instruction under artist Arne Isacsson. At the Gerlesborg Foundation's inaugural meeting of 16 June 1963, Bohuslän municipal council chair Einar Dahl became vice-president of the Foundation which, with the help of government grants, financed the arts school. Dahl was appointed as the school's principal, but was also principal of Gräskärrs Yrkesskola, a trade school.
After his election on 16 September 1956, Dahl was a member of the Riksdag's second chamber for Bohuslän until the election of 1 June 1958, when he was elected to represent Bohuslän (mandate period 1958-1965) in the first chamber.
He learned the international language Esperanto as early as 1921, becoming active within Sweden and also internationally in the Esperanto movement. He was a leader in the Swedish movement, writing Esperanto por la lernejo (for students) and Kiel oni gvidas daŭrigajn Esperanto-kursojn (for teachers). He also authored booklets of Esperanto dialogues and skits.
He was a director of the Swedish Esperanto Teachers Federation and in 1931 became president of the World Esperanto Pacifist League (Universala Esperantista Pacifista Ligo). In 1949 he was elected secretary-treasurer of the newly founded international League of Esperanto Teachers.
For several years Dahl was nominated by the UEA as a candidate for the Nobel Peace Prize. In 1965, he was the chief proponent in the Swedish Riksdag of a common Scandinavian proposal that UNESCO should undertake a fundamental inquiry into the need for an international communications medium. Dahl took part in many universal congresses. In 1970 he was awarded the Swedish gold medal "Pro Socia Merito".1932: Dialogoj en Esperanto: por kursoj kaj grupaj kunvenoj ("Dialogues in Esperanto for Classes and Group Meetings")
1933: Dialogoj kaj komedietoj: por kursoj kaj grupaj kunvenoj ("Dialogues and Comedic Skits for Classes and Group Meetings")
1933: Huru leder man fortsättningskurser i Esperanto? ("How does one lead an intermediate course in Esperanto?", Swedish)
1946: Lärobok i Esperanto för skolan ("Esperanto Textbook for Schools", Swedish)
1947: Arbetsbok i Esperanto ("Workbook in Esperanto", Swedish)