An anti-union screed from 1950 (art credited to comic strip legend, Dan Barry). Possibly passed out to employees of National Association of Manufacturers members:
Here's some background on NAM from Wikipedia:
In 1903, David MacLean Parry delivered a speech at the annual convention of the National Association of Manufacturers that was focused on organized labor. He argued that unions' goals would result in "despotism, tyranny, and slavery." Parry advocated the establishment of a great national anti-union federation under the control of the NAM, and the NAM responded by initiating such an effort. The NAM encouraged the creation and propagation of a network of local anti-union organizations, many of which took the name Citizens' Alliance. The national Citizens' Alliance entity came to be called the Citizens' Industrial Alliance.
According to Adam Curtis's documentary "The Century of the Self", NAM used Edward Bernays in the 1930s to combat the policies of President Roosevelt. NAM made efforts to undermine organized labor in the United States before the New Deal.