This was the size of our world class when Marx in the Inaugural Address of the International Working Men's Association, written the following month, launched his historic appeal "Proletarians of all countries, unite!".
Almost one hundred years later, in the mid-twentieth century, the numbers of the international proletariat verged on 300 million, out of a global population of about two and a half billion. There would be a billion wage earners around 1990 and a billion and a half in the first years of the last decade.
Today, the figure stands at about two billion and, together with their families, they now account for the majority of the human race."