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As a student, Ericson was an active member of Heimdal, then a member organization in the Confederation of Swedish Conservative and Liberal Students, and a member of the student union council representing the student party Fria Studenter.
He was the chairman of the Confederation of Swedish Conservative and Liberal Students, opposed the occupation of the Student Union Building in Stockholm in 1968 and was a co-founder of Borgerliga Studenter – Opposition '68 later in the same year.