Frank Tannenbaum (1893–1969) was a man of many parts. He was brought up by immigrant parents on a New England farm, which may explain his sympathy for small farmers. At the same time, however, he embraced the cause of urban workers and became a Wobbly and an anarcho-syndicalist theorist. In fact, Tannenbaum first made a name for himself as an advocate for the unemployed, the homeless, and the imprisoned—the latter after being jailed for his role organizing those at the bottom of United States urban society. Yet he also studied with John Dewey at Columbia University and got a doctorate at the Brookings Institution with a thesis on the Mexican agrarian reform, inaugurating three decades of engagement with the Mexican Revolution. During this time Tannenbaum became the friend and adviser of ministers and presidents.