I was looking into the historical data on strike days in Britain for a feature in Catalyst, but there's a lot more to discuss than we could fit in the paper, so I've extended it to a blog post.
This is the graph we printed in Catalyst. The green line represents thousands of strike days and is read from the left y-axis, black represents inequality as measured by the Gini coefficient, and is read off the right y-axis (100 = one person owns everything and 0 = perfect equality. Worldwide, Gini coefficients range from approximately 23 (Sweden) to 70 (Namibia) although not every country has been assessed). Click on the charts for high-res versions.