Most people think of Martin Luther King Jr. as a civil rights leader who led the nation in addressing the evils of systemic racism. What many don't know is that he also championed labor unionism.
Central Americans who came to the US in the 1980s fleeing civil war drew on their background fighting for social justice back home to help unionize farmworkers, janitors and poultry packers in the US.
Irish immigrants and their descendants played a leading part in the Easter Rising of 1916 and Ireland's subsequent rebellion. But the inspiration worked in the other direction as well.