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. In 1993, Ericson was editor in chief of Confederation of Swedish Conservative and Liberal Students' journal Svensk Linje. In 1998, Ericson partnered with Per Bylund and Thord Swedenhammar to found the anarchist web site Anarchism.net.