Committee for International Workers Aid (formerly "Friends of Soviet Russia") was a Communist organization created in Berlin in 1921 (as the International Arbeiter-Hilfe) to help raise money for famine and drought victims in Russia. It was evidently expanded to include collecting money to help victims and prisoner of Fascism, which seems to be the major target of this folding broadside.
The bucket here is a paper one, the pamphlet unfolding to be a broadside or broadsheet onto which you'd record peoples' names and addresses and the amount of their contribution to help "class war victims of the laboring masses", to help the imprisoned and their families ("they are in for us who are out". 12.5x8 sheet folded into quarters. Fine condition save for a tear that I just made at the bottom center fold.
This is a scarce item--I could only find two copies (Yale and UC Davis) in WorldCat.