In 1967, before Pentecostalism was a hot topic of study, John Howard Yoder noted (in Concern),

 "Pentecostalism is in our century the closest parallel to what Anabaptism was in the 16th.  Expanding so vigorously that it burst the bonds of its own thinking about church order, living from the multiple gifts of the Spirit in the total church while holding leaders in great respect.  Unembarrassed by the language of the laymen and the aesthetic tastes of the poor, the mobile, the zealously single minded.  We can easily note the flaws of pentecostal theology, organization, and even ethics.  Very similar by the way to the faults of the early Quakers and Anabaptists, or even of the apostolic churches, but meanwhile they are out there being the church."

For more on the similarities between Anabaptists and Pentecostals, listen to Dr. Martin Mittelstadt's "My Life as a Mennocostal."  Dr. Mittelstadt is an Assemblies of God minister and faculty member at Evangel University in Springfield, Missouri.