Oh yes, there were Radical Catholics. The timing was for several hundreds of years, but the most bloody were those from about 1090 to 1290 (the Crusades). It really doesn't get a whole lot more radical than at that time.
As for today, the Catholic Church is quite different. There is still a separation (although a bit more peaceful today) between Protestant and Catholic Northern Ireland. At times, some might have called that Radical Catholicism/Protestant practices. We have Opus Dei becoming a personal prelature to Pope JPII and they are rather radical for Catholics.
https://home.netcom.com/~mjr40/od/gq.html
However, there really isn't a group of catholics that are waging a war to convert the non-believers over by force as there was during the Crusades. Catholicism of today is rather peaceful.