Canaris and his associates were not necessarily committed to the overthrow of Hitler's regime, but they were loosely allied to another, more radical group, the "anti-Nazi" faction led by Colonel Hans Oster and Hans Bernd Gisevius who wanted to use the crisis as an excuse for executing a "putsch" to overthrow the Nazi regime. The most audacious plan contemplated by Canaris, in collaboration with Ewald von Kleist-Schmenzin, was to capture and unseat Hitler and the entire Nazi Party before the invasion of Czechoslovakia. At this particular moment, Kleist visited Britain secretly and discussed the situation with British MI6 and some high-ranking politicians. There, the name of Canaris became widely known as Kleist's executive hand in the event of an anti-Nazi plot.