#OtD 5 Sep 1917 mass arrests of radical American workers took place as US marshals raided the national offices of the Socialist Party and of the @iww@mastodon.social union, as well as some 20 branch offices of the IWW in different states. Learn more: https://workingclasshistory.com/2018/05/23/wch-e6-the-industrial-workers-of-the-world-in-the-us-1905-1918/