1920s

• CSAO refuses to join a national civil service federation because it looked too militant.

• Government introduces retirement at age 70 on a week's pay for every year of service. Widows get half that amount.

• A job classification system is developed for the OPS during the decade. Pay rates overwhelmingly favour men.

1926

• CSAO stops using government letterhead and starts publishing the Civil Service Review.

1927

• CSAO incorporates. That incorporation is one reason that, even today, OPSEU has annual conventions, compared to the biennial ones of most unions. CSAO also runs the government parking lot and the cafeteria in Toronto and sells gas at a discount to members.

1928

• CSAO asks the government for a grievance system, but doesn't get it.

1930

• The Great Depression leaves anyone with a job feeling pretty lucky. Ontario civil servants accept wage rollbacks to retain their jobs as the country goes through an economic upheaval.

1939 - 1945

• The Second World War sees a huge influx of women into the workplace and non-traditional jobs as the men join up to serve overseas.

F. G. Beardall was elected president of CSAO in 1928. He pioneered group insurance.