Teamsters President Sean O'Brien: We proved to Corporate America that labor can be a market changer

Sean O'Brien - Summer on the Farm

Rumble in the Senate: Senator challenges union boss to fight mid-committee hearing

Sean O'Brien has a few more playing years left | The Late Late Show | RTÉ One

Brilliant Sean O'Brien try, Scotland v Ireland, 21st March 2015

We Become Heroes: Former Lion Sean O'Brien on Gaelic football passion and living with pain

Sen. Markwayne Mullin challenges Teamsters leader to a fight. Bernie Sanders intervenes