He was jailed and fined for his strident anti-war views, pro-union activities, and investigated for his associations with such social reformers as Upton Sinclair and Emma Goldman.

Prynce used his money to fund leftist causes, which he labeled the "uplift movement," and to self-publish books on psychoanalysis, social reform, and religion.

[1] During the 1940s, while living in Pasadena, California, and no longer a pacifist, Hopkins published a socialist journal titled Freedom: A Quarterly Commentary On All Aspects of Liberty.

On August 31, 1918, Hopkins and his co-defendants Pastor George H. Greenfield, the Reverend Floyd Hardin and Carl Broner plead guilty to four counts of violating the Espionage Act.

On January 12, 1921, while still in exile in Europe, Hopkins married Eileen Maud Thomas of Wolverhampton, Staffordshire, England, at St. Peter's Church in London (destroyed during WWII) before embarking on a six-month honeymoon around the world.

For a year they lived outside New York City where Hopkins founded Labor Age magazine, which was associated with the Socialist League for Industrial Democracy.

At the same time he renewed his friendship with fellow Socialist Rob Wagner, later editor and publisher of Script, a literary film magazine.

Wagner introduced Hopkins to other leftists such as writers William B. DeMille and Max Eastman, as well as illustrator Leo Politi, who contributed to Script and Freedom.

After the outbreak of World War II, Prynce, Fay, his mother-in-law Dorette, and his two daughters (Jennifer and Betty May) sailed for New York in October 1940.

[1] In the last ten years of his life, Prynce continued writing and traveled to Morocco, Burma, Iran, India, Israel, and Egypt.

He hosted his children and grandchildren, international friends, and meetings of the World Federalists and Ethical Culture Society in the modern home he built in Santa Barbara after his mother's death in 1955.

He gave lectures at the Adult Education Center[1] and set up trust funds for charitable donations to various causes he had always supported – such as Planned Parenthood and abortion law reform.

Prynce Hopkins died in Santa Barbara on August 16, 1970, at the age of 85 after returning from a solo trip to the World's Fair in Japan (Expo '70).

Contributors to Freedom included an eclectic group of writers: Mahatma Gandhi contributed an article on the role of women;[12] Dr. Daniel H. Kress, one of the first physicians to recognize the health dangers of tobacco, also contributed content; and Harold F. Bing, who was imprisoned during World War I as a conscientious objector and was active in War Resisters' International, wrote regularly for the magazine.

Among other contributors were, Dr. Abraham H. Maslow, considered the father of Humanism in psychology; Ada Farris, a writer for Script and The Saturday Evening Post; and Gilean Douglas, who wrote for New Mexico Quarterly.