Missionaries to the Preborn
Missionaries to the Preborn (MTP) was a spin-off organization to Operation Rescue, described by Tom Burghardt as "one of the most dangerous and violent of the direct action anti-abortion groups active in the United States." 
After the founding in 1990 of MTP in Milwaukee, Wisconsin by the Rev. Matthew Trewhella, "four of Milwaukee's nine women's clinics [were] closed; primarily as a result of their relentless attacks." In 2002, the MTP "relocated their national office to San Bernadino county in California. 
"Matthew Trewhella, Joseph Foreman and Gary McCullough, the chief organizers of the group." At the time, they were "members of Howard Phillips' far-right, United States Taxpayers Party (USTP)" and Trewhella was "a member of the USTP's National Committee.
- Tom Burghardt, "God, Guns & Terror: Missionaries to the Preborn," Bay Area Coalition for Our Reproductive Rights (BACORR), November 13, 1994.