The principles of Communism, Fredrick Engles
https://www.marxists.org/archive/marx/works/1847/11/prin-com.htm
Wage Labour and Capital, Karl Marx
https://www.marxists.org/archive/marx/works/1847/wage-labour/
Value, Price, and Profit, Karl Marx
https://www.marxists.org/archive/marx/works/1865/value-price-profit/index.htm
https://www.marxists.org/archive/marx/works/1845/german-ideology/
http://www.sinistra.net/lib/pro/whyrusnsoc.html
An Appeal to the Young
http://dwardmac.pitzer.edu/Anarchist_Archives/kropotkin/appealtoyoung.html
https://www.marxists.org/txtindex.htm
http://www.marxist.net/
http://www.marxistsfr.org/index.htm
http://www.allaboutphilosophy.org/what-is-marxism-faq.htm
https://www.reddit.com/r/Marxism/
http://www.trotsky.net/marxism_and_kondratiev.html
theanarchistlibrary.org/
https://www.cla.purdue.edu/english/theory/marxism/
http://www.infoshop.org/
https://theanarchistlibrary.org/special/index
http://anarchism.pageabode.com/anarcho/170-years-of-anarchism
https://libcom.org/
http://www.infoshop.org/AnarchistFAQSectionA
http://www.dsausa.org/what_is_democratic_socialism
https://www.socialistpartyusa.net/
Left and Left Leaning News and Commentarty
Roar
https://roarmag.org/
Shadowproof
https://shadowproof.com/
Counter Punch
https://www.counterpunch.org/
Current Affairs
https://www.currentaffairs.org/
Indy Media
https://www.indymedia.org/or/index.shtml
Mother Jones
https://www.motherjones.com/
The Monthly Review
https://monthlyreview.org/
The Root
https://www.theroot.com/
Splinter
https://splinternews.com/
Dissent Magazine
https://www.dissentmagazine.org/