How will QAnon influence U.S. politics in 2020 and beyond?

What’s happening: Over the weekend, hundreds of Save the Children rallies were held in cities across the country. On the surface, the demonstrations appeared aimed at raising awareness of human trafficking. But many of the marches were planned and carried out by followers of a growing and dangerous conspiracy theory known as QAnon.

The core of QAnon is a belief that a high-ranking government insider — known as “Q” — is working alongside President Trump to take down an international child-trafficking ring run by a cabal of Satan-worshipping pedophiles led...