Career
He was a prominent leader of the early Swedish Social Democratic Party. Danielsson retranslated Karl Marx"s Communist Manifesto into Swedish in 1886. Danielsson faced legal charges of blasphemy for a controversial article published in Hjalmar Branting"s Social-Demokraten: the legal process culminated in the conviction of both mentor
Imprisoned in 1888, Danielsson celebrated the event by composing a pamphlet on the labour theory of value while serving out his sentence.
During his imprisonment, his paper was managed by his fiancee, Elma Danielsson. Danielsson died in Germany.