NORTHAMPTON — Jennifer Taub was fresh from the Boston Women’s March when she tweeted a thought. She didn’t expect that tweet would launch the next big movement.

Taub, city resident and law professor at Vermont Law School, said her tweet caught fire overnight.

“Let’s plan a nationwide #DivestDonald and #showusyourtaxes protest for Saturday, April 15,” she wrote on a whim on Jan. 22.

Now, she’s a lead organizer among hundreds working to make that idea a reality this Saturday. The march is not only happening in Washington, where she’s investing most of her organizing efforts, but in 150 cities in the U.S. and internationally. Taub’s efforts were featured this week in The Guardian.

The marches will urge President Donald Trump to release his tax returns.

“It was clear that we struck a nerve,” she said of the initial tweet, which was picked up and embedded in a Huffington Post article that same night. “It really became clear given the momentum and response that we had tapped into something that people were thinking and feeling.”

As a law professor, Taub specializes in business law, corporate corruption and white collar crime. She said a comment from Trump counselor Kellyanne Conway alleging that “people don’t care” about Trump’s tax returns sparked her initial tweet.

“I just thought that was arrogant and incorrect,” she said. “I think he owes it to the people to be transparent and show his tax returns like every president since Watergate.”

She said she hopes the march also draws attention to tax policy, a topic Congress is about to take up.

Taub says the whole Twitter post-turned-action is an example of how social media can propel movements, and it’s a reminder “we need to do more than just hit ‘like’ on social media.

“When I saw people reacting, I thought, I’ve got to do more than this,” she said. “This is a story of how social media can be used to energize, empower and inform. And then we can step outside those spaces and into real public spaces to be heard.”

The D.C. Tax March begins Saturday at noon in front of the U.S. Capitol. Those unable to make the trek can also find sister marches in Pittsfield and Boston. For more information, visit taxmarch.org.

“Everyone is working together and I’m so grateful that so many people felt moved to do this,” Taub said. “I think that’s what’s important.”