[1] He was the youngest of five siblings and his father died barely a year later, and the mother was left to cope with the family's livelihood on her teacher's salary.

[2] He passed studentexamen in 1936[1] and studied economics at Stockholm University College, but most of his time was devoted to intense political activity.

Björk was also chairman of the 1968 Literature Inquiry (1968 års litteraturutredning) and a member of the Integration Safety Committee (Integrationsskyddskommittén).

[5] Knowledge and opinion also characterizes the books about international relations and Swedish foreign policy that he published during the period as a journalist and later after his retirement.

After retirement he also took up his old interest in history, which led to a major commitment in the Workers Cultural Society (Arbetarnas Kulturhistoriska Sällskap).