WASHINGTON — When Anooha Dasari, 16, heard the federal government was about to kill rules that guaranteed an open internet, she contacted her United States representatives for the first time, asking them to stop the action.

The Mundelein, Ill., high school junior then passed around a link to classmates for a website that automatically placed calls, web comments and emails to the Federal Communications Commission, the agency that was moving to repeal the so-called net neutrality rules. When the F.C.C. voted last week on the rollback, Ms. Dasari stayed glued to her smartphone for updates while taking her American government class.

“For research, for news, to communicate with friends, the internet is a big part of my life,” Ms. Dasari said. “It has formulated my personality, opinions and political ideology. If it is controlled, my generation of students could be inclined to be just on one part of the spectrum. That’s dangerous.”

Millions of Americans have been caught up in a bitter debate over the repeal of net neutrality rules that prevented broadband providers from blocking websites or demanding fees to reach consumers. But the most vocal and committed activity may have come from generation internet, the digitally savvy teenagers in middle and high school who grew up with an open internet.