Denis Kearney (1847–1907) was a California labor leader from Ireland who was active in the late 19th century and was known for his anti-Chinese activism. Called "a demagogue of extraordinary power," he frequently gave long and caustic speeches that focused on four general topics: contempt for the press, for capitalists, for politicians, and for Chinese immigrants. A leader of the Workingmen's Party of California, he is known for ending all of his speeches with the sentence "And whatever happens, the Chinese must go"

A demagogue, or rabble-rouser, is a political leader in a democracy who gains popularity by arousing the common people against elites, especially through oratory that whips up the passions of crowds, appealing to emotion by scapegoating out-groups, exaggerating dangers to stoke fears, lying for emotional effect, or other rhetoric that tends to drown out reasoned deliberation and encourage fanatical popularity. Demagogues overturn established norms of political conduct, or promise or threaten to do so.