This Sticker - Silent Agitator was issued and sold in the 1960s by the Industrial Workers of the World ( I.W.W.) to raise funds and support.  At that time, the IWW was enjoying a resurgence in support and organizing activities.

The sticker displays the IWW Black Cat and reads:  BEWARE  GOOD PAY OR BUM WORK  I.W.W.  AONE BIG UNION  WE NEVER FORGET SABOTAGE. One Big Union (OBU) was a prominent IWW slogan throughout the years. 

The Black Cat (“Sab-Kitty” or “Sabo-Tabby”) as the IWW's icon for sabotage and direct action.

Silent Agitators

The Industrial Workers of the World, which during its history has pioneered a variety of tactics, used stickers to publicize their philosophy or cause, calling them silent agitators or silent organizers.  The IWW publication "Industrial Worker" out of Spokane, Washington, advertised stickers as early as April 20, 1911.

"Wobbly organizers were revolutionary fish swimming in the sea of bindle stiffs and tramp workers. The Wobbly card was a ticket to ride the rails. "Side door coaches," as box cars were called, were plastered with paper stickers, "silent organizers," that Wobs put up everywhere they passed: "Join the One Big Union," "I Will Win," "Win a World."" (Professor Eric Margolis) 

Professor Margolis described the way such stickers were used when the Wobblies called a strike in 1927:

"Bill Lloyd, Superintendent at the Puritan Mine (in Colorado's northern coal field), went to work one chilly Autumn morning to discover Wobbly stickers pasted on every timber and cross beam in the place: "Join the Wobblies, Join the Wobblies," he said indignantly, "From the bottom of the shaft clear to the working faces, see, they had these posters." (Id.)

Big Bill Haywood described in his autobiography how the IWW issued stickers to propagandize against the First World War. The stickers declared, "Why be a soldier? Be a man. Join the I.W.W. and fight on the job for yourself and your class."sI

The IWW, is an international labor union founded in Chicago in 1905. Its ideology combines general unionism with industrial unionism, as it is a general union, subdivided between the various industries which employ its members. The philosophy and tactics of the IWW are described as "revolutionary industrial unionism", with ties to socialist, syndicalist, and anarchist labor movements.

I.W.W. in the 1960s

The 1960s civil rights movement, anti-war protests, and various university student movements brought new life to the IWW, albeit with fewer new members than the great organizing drives of the early part of the 20th century. The 1960s saw organizing efforts among students in San Francisco and Berkeley, which were hotbeds of student radicalism at the time. (See image.)

IWW members united for one more "free speech fight": Berkeley's Free Speech Movement. (See image.) Riding on this high, the decision in 1967 to allow college and university students to join the Education Workers Industrial Union (IU 620) as full members spurred campaigns in 1968 at the University of Waterloo in Ontario, the University of Wisconsin–Milwaukee, and the University of Michigan in Ann Arbor.

The IWW sent representatives to Students for a Democratic Society conventions in 1967, 1968, and 1969, and as the SDS collapsed into infighting, the IWW gained members fleeing this discord. These changes had a profound effect on the union, which by 1972 had 67% of members under the age of 30, with a total of nearly 500 members. 

The IWW's links to the 1960s counterculture led to organizing campaigns at counterculture businesses, as well as a wave of over two dozen co-ops affiliating with the IWW under its Wobbly Shop model in the 1960s. These businesses were primarily in printing, publishing, and food distribution, from underground newspapers and radical print shops to community co-op grocery stores.

These ties to anti-authoritarian and radical artistic and literary currents linked the IWW even more heavily to the 1960s counterculture, exemplified by the publication in Chicago in the 1960s of Rebel Worker by the surrealists Franklin and Penelope Rosemont.