“Anarchists of the world, unite!” is a jocular slogan that has been printed on T-shirts. The saying is a parody of “Workers of the world, unite!” from The Communist Manifesto (1848), by Karl Marx and Friedrich Engels.
 
“Anarchists of the world unite, you have nothing to lose but your decentralized principles” was cited in print in 1971, when it was recorded as graffiti from the Paradox Restaurant, East Village, New York City, in the book Graffiti: Two Thousand Years of Wall Writing. “Anarchists of the world, unite!” received more popularity in the 2000s, when the saying was used on many political blogs.
 
   
Wikipedia: Workers of the world, unite!
The political slogan “Workers of the world, unite!” (German: Proletarier aller Länder vereinigt Euch!, literally “Proletarians of all countries, unite!”) is one of the most famous rallying cries of communism, found in The Communist Manifesto (1848), by Karl Marx and Friedrich Engels. A variation (“Workers of all lands, unite”) is also inscribed on Marx’s tombstone.
 
This slogan was the USSR State motto (Пролетарии всех стран, соединяйтесь! Proletarii vsekh stran, soyedinyaytes’!), appeared in the coat of arms of the Soviet Union, on 1919 Russian SFSR banknotes (in German, French, Chinese, English, and Arabic), on Soviet coins from 1921 to 1934, and in most Soviet newspapers. Contemporarily, some socialist and communist parties[who?] continue using it. Moreover, it is a common usage in popular culture, often chanted during labour strikes and protests.
 
Google Books
Graffiti:
Two Thousand Years of Wall Writing
By Robert George Reisner
Chicago, IL: H. Regnery Co.
1971
Pg. 174:
Anarchists of the world unite, you have nothing to lose but your decentralized principles.
(Paradox Restaurant, East Village, New York City.)
   
Google Groups: alt.society.civil-liberty
Jim Heath
1/16/92
(...)
Anarchists of the world unite!
You have nothing to lose but, ahem, your anarchy..
 
Google Groups: alt.magick.tyagi
GvCdf: Anarchists of the world Unite!
nagasiva
6/11/96
[from alt.society.anarchy: George van Claussendorf

]
Howard Olson wrote:
>
>    I think it is time for anarchists to focus on the State as the
> enemy rather than each other. The flames on this newsgroup must give a
> great deal of aid and comfort to our mutual enemy, the State.
   
New York (NY) Times
CRITIC’S NOTEBOOK; Anarchists of the World, Unite in Your Literary Roots!
By Walter Goodman
Published: August 03, 2000
The appearance of some self-proclaimed anarchists among the protesters at the Republican convention is tantalizing but perplexing. With radical effusions so out of style, what are we to make of these figures from beyond the fringe?
 
Reason.com
Anarchists of the World, Unite!
The Libertarian Party’s radical candidates aren’t conceding anything to the media-appointed frontrunners
David Weigel | May 24, 2008
“It’s the first presidential campaign button with a marijuana leaf,” says Steve Kubby, grinning ear to ear. He whips out a tiny Kubby ‘08 pin with red letters pasted onto a familiar green leaf. Alabama political operator Steve Gordon, the suddenly controversial (after selling his Third Party Watch website to longtime GOP direct-mail activist Richard Viguerie) former Libertarian Party political director who’s working for presumed frontrunner Bob Barr, takes the pin and thanks him.
 
Small Dead Animals
December 31, 2009
Anarchists Of The World, Unite!
“Anarchism never was the sort of closed totalitarian system that Marxism aspired to be.”