He worked for many years in the construction industry in both Great Britain and Ireland and was a shop steward in the Dublin Construction Branch of the then Irish Transport and General Workers Union (now SIPTU), before becoming a full-time branch official.
Finnegan was for many years the Workers' Party director of elections in Dublin West on behalf of then party President Tomás Mac Giolla. He contested the 1981 Irish general election for the party (then known as Sinn Féin The Workers Party) in Dublin West, polling 0.7%, as a second candidate to Mac Giolla who was to be elected in the constituency in the November 1982 general election and the 2007 general election in Dublin Mid–West, polling 0.98%. Finnegan also unsuccessfully contested the 1999 Irish local elections, polling 3.4% of the vote and the 2009 local elections in the Lucan electoral area, polling 4.6% of the vote.
- Scaffolders demand rise - 21 April 1999 - Contract Journal[dead link]
- photo in Poll Position, Sean Donnelly's guide to the 1991 local elections, ISBN 0-9520197-0-1
- ElectionsIreland.org: Mick Finnegan
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