1640s, from agitation
(q.v.); originally "elected representative of the common soldiers in Cromwell's army," who brought grievances (chiefly over lack of pay) to their officers and Parliament. Political sense is first recorded 1734, and negative overtones began with its association with Irish patriots such as Daniel O'Connell (1775-1847). Historically, in Amer.Eng., often with outside
and referring to people who stir up a supposedly contented class or race.