Heresy
Uncertain Reaction
All of this progressed by steps--rapid steps, to be sure, but it's worth detailing some of the highlights in the years after Hus' execution.
Late in 1416 Wenceslaus made some initial moves against the Hussites, but he wasn't very serious about it and soon gave it up. Nothing really happened. Around the same time, Cenek of Vartemberk, a Bohemian noble, had a local bishop start ordaining Hussite priests. This was how an area became "Hussite"--the local lord promoted or at least protected the believers, and employed public powers to let buildings become churches and individuals become priests.
In March 1417, Charles University declared lay use of the chalice was legitimate. This marked a break not only with the pope, but with the General Council of the Church at Constance. Over a thousand years of Church precedent and theology alike said that while a pope might err, a general council of the Church could not, so for the University to break with the Council was a serious matter indeed.
November 1417, the Council chose a new pope: Martin V. This brought the Great Schism to an end and brought to power a pope who made restoration of papal authority his first order of business. He was very much preoccupied with contending with the conciliarists and with securing Rome and the Papal States, but he did lend all the support he could to exterminating the heretics in Bohemia.