Ambrose Bierce on Agitation.
Thursday, December 12th, 2002Alina writes to say that the famous humorist defines “agitator” in the wonderful Devil’s Dictionary thusly:
A statesman who shakes the fruit trees of his neighbors to dislodge the worms.
I like it.
TheAgitator.com

Sounds like the Chinese expression beating the grass to startle the snake.