Party President Tomás Mac Giolla came over and organised the merger with Seamus Collins from Birmingham who was the Clann Chairperson for most of its existence.
Clann organized political meetings and protest marches and collected funds to support the movement's activities in Ireland.
[1] Attempts were made in the mid-1960s to amalgamate Clann na hÉireann with the Connolly Association (which in turn shared some members with the Communist Party of Great Britain).
However, despite the efforts of the Dublin leadership, this proposal was not accepted at the relevant Clann na hÉireann Ard Fheis.
The BBC documentary, Birmingham Irish I am, which aired in February 2020, details part of the history and activities of Clann, and interviews two main members, Seamus Collins and Padraig Yeats.