Here’s some quick links to Etzler’s works and criticisms thereof.

• The Paradise Within the Reach of All Men, Without Labour, by Powers of Nature and Machinery: An Address to All Intelligent Men by J.A. Etzler himself
• Paradise (to be) Regained by Henry David Thoreau
• John Adolphus Etzler, context and life history by the historian Joel Nydahl
• Robert Owen, influential British utopianist, Wikipedia
• Charles Fourier, influential French utopianist, Wikipedia