Irish Racism Towards the Black community in the US

Brian Boyd on Irish racism towards the black community in the US:

http://www.irishtimes.com/opinion/brian-boyd-clinton-s-running-mate-does-not-know-his-irish-american-history-1.2819155

And a more academic piece by Diarmaid Ferriter on the same topic and on whether the NINA signs (No Irish Need Apply) really existed:

http://www.irishtimes.com/opinion/diarmaid-ferriter-irish-americans-will-not-all-vote-as-immigrants-1.2820798