Call it the Accidental Resistance: After the 2016 presidential election, former congressional staffers Leah Greenberg and Ezra Levin started a viral Google Doc guidebook to political resistance to the Trump agenda. That was the kernel of a grassroots political movement called Indivisible, which a year later has inspired more than 5,000 local groups to action on issues like preserving the Affordable Care Act, supporting public schools and challenging the administration’s immigration policies.

Downloaded more than two million times, the husband-and-wife team’s original document — now proofread and reworked into a sleeker 26-page version — provides progressives with practical advice, such as the best way to contact a local member of Congress, voice opposition at a town hall and speak with the media. Working with a variety of groups in fighting against what Levin and Greenberg see as policies threatening the unity of the country, Indivisible stays true to its name, which stems from the Pledge of Allegiance: “One nation under God, indivisible, with liberty and justice for all.”

This article originally appeared on Recode.net.