The 1910 Rules Committee Reform Resolution, On March 19, 1910, a group of Rebellious Progressive Republicans Rebelled against Speaker Joseph G. Cannon; uniting with democrats to strip the speaker of a large chunk of his power.
Throughout Cannon's near decade long speakership, he was a conservative force on Presidents Theodore Roosevelt and William Taft, controling the house with an Iron grip he was able to effectively fight the presidents against some of their more progressive desires.
This for that decade did not sit well with a growing number of Republicans, with an increasing ammount seeking reform, Eventually on March 16, 1910—upon a house overuling Cannon on a floor vote for the first time in the speaker's history—the insurgents saw an opening.
Said opening resulted in the insurgents motioning to move forward a resolution that would ban Cannon from serving on or appointing the rules comittee,
while Canon tried to stop the vote with some procedural tricks, recesing the house & bringing back absent representatives he was overuled, resulting in the resolution passing.
The GOP would lose their house majority in 1910, not gaining it back until 1918—hence-which Cannon wouldn't return to the speakership but rather an elder statesman with a seat on the powerfull Appropriations comittee he had once chaired.