After the Grimm–Hoffmann Affair he had to resign from this function. Grimm was the leader of the Swiss General Strike in November 1918. The demands of the strike included the 48-hour working week, old-age pensions and women suffrage.
Grimm was among the founders of the 2½ International.
He held various parliamentary seats and executive functions from communal to federal level between 1909–1955. In 1946 he became President of the Swiss National Council.
Grimm, Robert in German, French and Italian in the online Historical Dictionary of Switzerland. Robert Grimm Papers in the International Institute of Social History*.