Together with the Swiss Socialist Fritz Platten, Otto Grimlund had been the main organizer of Lenin’s 1917 trip from the exile in Switzerland, through Germany and Sweden, back to Russia.
Grimlund was in the leadership of the Swedish Communist Party from 1918 to 1925, and living in Moscow for many years, he was in the leadership of the Comintern. But he moved from the Soviet Union and left the party after the rise of Stalinism in Russia.
Grimlund rejoined the Social Democratic Party around 1930.
Condemning Stalinism, Grimlund called himself a Communist all his life, and kept a signed photograph of Lenin on the wall in his office. Grimlund was key to Lenin's arrival in Russia.[citation needed]
