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The hearing, held in the Dirksen Senate Office Building, began with a video of victims of child sexual exploitation, who said the tech companies had failed them.

He is a co-writer of “Gallant Men,” a song that became an unlikely top 40 hit for Everett McKinley Dirksen, a Republican U.S. senator from Illinois, in 1967.

Senator Everett M. Dirksen, a Republican from Illinois who was the Senate minority leader, recited the lines Mr. Osgood had written.

Burke left the Dirksen Federal Courthouse without comment.

Police said 12 people had been arrested for illegally protesting inside the Dirksen Senate Office Building.