AB paper was started directly after the 1929 split of the Communist Party of Sweden (SKP), when the Kilbom faction took the regional SKP publication Väst-Svenska Kuriren with them.
AT functioned as the regional publication of the SKP led by Hugo Sillén.
During World War II, AT became the most frequently confiscated newspaper in Sweden.
When the transportation ban was lifted in 1943, the printing was shifted back to Stockholm.
In 1974, AT was merged with the main party publication, Ny Dag.