 Membership in the ASSK was open to all Finns at least 18 years of age who accepted basic socialist doctrine and paid minimal dues.The ASSK was a very small group in its initial inception, consisting of 27 members at the time of its 1904 formation and growing to 59 by 1909.Thereafter the organization grew rapidly, hitting a membership of 250 in 1911, nearly 18% of the members of the Socialist Party of Oregon.