While I know "protest songs"have never been Paul's "sweet spot", I have always liked "Give Ireland Back to the Irish". I think it was a great rocker. From the same time era (but not protest songs) came other rockers like "The Mess" and "Soily". The former was never on an album (it was a B-side) and the latter never was on an album until the "Wings Over America" was released in 1976 I believe. "Give Ireland Back to the Irish was, as mentioned, a banned Single and it never has appeared on a proper album or even a compilation set.
Paul has so many good to great songs that were never on his proper albums but relegated to either B-sides or just are officially unreleased songs. That is why I have been putting compilation lists together "BY DECADE"of these "Lost and Forgotten" songs.
I have been detailing potential songs for each decade (starting with 1970) in the "TAKE IT AWAY" Thread on this Site. It is on this "Not Such A Bad Boy" topic entitled "Take It Away". This thread has been detailing all the Post Beatles' Paul McCartney songs in a series of Podcasts. As the Podcasts have been completing a decade, I have been putting a 2 CD compilation Package together as the Podcast completes each decade. I have also added tracks that are either rare "Live" versions or "rehearsal" tracks from many of Paul's Post Beatles' Albums. The aim is that between the unreleased, B-sides, and Rare live versions, you don't get duplications of songs already on the original album or already on Greatest Hits Packages like Wingspan. For those interested in Paul's Solo career, I would especially recommend the "Take It Away" Podcasts. The moderators, Chris and Ryan are very good. You would be amazed at Paul's rare stuff and how many songs there really are.
As a big time Macca fan (Beatles, Wings and Solo) I was really disappointed over Paul's last Compilation Package called Pure McCartney. Even the 4 CD package duplicated so many songs already on earlier Paul albums or on greatest hits packages. They also just skipped entire sections of Paul's full career. That is why the true fans would crave a package featuring so many good unreleased tracks, B-sides and rare "live" versions in one compilation.