But here's something you may not know: One of the national co-chairs of the march, Linda Sarsour, is an advocate of Sharia law.
Sarsour once tweeted, "You'll know when you're living under Sharia law if suddenly all your loans and credit cards become interest free. Sounds nice, doesn't it?" She has also defended the Saudi regime, which does not allow women to drive.
Sarsour also has terrorist connections. The New York Times reported in 2012 that "Members of her family had been arrested on accusations of supporting Hamas." The Daily Caller reports that last month she posed for pictures with an ex-Hamas operative.
Irony does not begin to describe millions of women marching for so-called "women's rights" under the leadership of a woman who is a defender of fundamentalist Islam, which is oppressing women all over the world.
I first noticed something odd about the march when I saw interspersed among the foul, vulgar signs that some women (and even children) were holding, other signs that read, "Free Birth Control, Free Palestine" or some variant.
We have reported for years on the bizarre alliance between the radical left and radical Islam. It is the continuation of what we have seen on university campuses, where young socialists make common cause with Palestinian student groups to fight and harass conservative students and those who support the U.S./Israeli alliance.
We have seen it in Europe where socialist and green parties united with Muslim voting blocs in London to elect the first Muslim mayor of a European capital. We have seen it in the Black Lives Matter movement, where Palestinian activists exploited the Ferguson riots and in a Black Lives Matter platform that accused Israel of genocide.
This is a dangerous and formidable alliance, and something that open border politicians in Congress should ponder when they consider what our immigration policies should be.