So what were the actual politics of the Hussites historically? I always find medieval heresies interesting but it feels like the discussion of "proto protestant" heresies in popularly available books tends to focus in on how much they actually were like later protestantism. Rather than taking them up on their own terms and actions. It seems interesting with the influence they took from Wycliffe, while actually being much more the motivating ideology for the revolt of the lower orders than Wycliffe's own beliefs were.
It's a bit tricky to analyze the "actual politics" of the Hussites of the Bohemian Reformation, because one of the things you come to understand about the Reformation, Counter-Reformation, the Wars of Religion, etc. is that religious symbolism can have really significant cultural politics in ways that can be very opaque and hard to understand for modern audiences.
(Take this as a strong hint for someone to ask me about how the Puritans of the English Civil War and colonial New England are completely misunderstood, especially on Tumblr.)
So leaving aside Jan Hus' broadly Wycliffian/proto-Lutheran position on religious issues like the need to fight corruption in the Church, the authority of the Bible over the Pope, opposition to indulgences, the critical importance of the vernacular Bible, and so forth - what were the politics of the Hussite movement?
Well, the Four Articles of Prague I think serve as a pretty good condensation of Hussite politics, although it's important to keep in mind that it was a political statement of the more conservative faction of the Hussites:
Freedom to preach the Word of God.
Freedom of the communion of the chalice (under both kinds also to laity).
Exclusion of the clergy from large temporal possessions or civil authority.
Strict repression and punishment of mortal public sins, whether in clergy or in laity.
So all of this sounds like it's more theology than politics, but if we analyze it, we can find the politics under the hood. Taking the first point, the Hussite movement was largely inspired by a popular revulsion to the Council of Constance burning Jan Hus at the stake despite the promise of safe conduct - so in reaction, they seemed to adopt a strong commitment to religious free speech.
Second, there is a strong emphasis on anti-clericalism: by the Middle Ages, the Catholic Church had come to emphasize the higher social status of the clergy over the laity by changing the ritual of communion such that, while communion in bread was given to the laity, only the priest was allowed communion in wine from the chalice. As a statement of social equality, the Hussites insisted that ordinary people should receive both forms of communion - and went one step further by insisting that children as well as adults should receive both - as a statement of the equality of all men before God.
Third, there is a strong dislike of Church corruption, which tended to emphasize the need for the clergy to devote themselves to poverty and spiritual matters rather than secular politics and moneymaking.
The more radical Hussites wanted to confiscate church lands and transfer them to secular hands, they believed that the Bible was the only authority for both religious and political matters, and they were very strict Biblical literalists who particularly emphasized Wycliffe's denial of transubstantion. In general, they tended to believe that society should be more democratic.
Finally, there's a strong element of Czech proto-nationalism: hence the emphasis on translating the Bible into Czech, and the successful defense of their religious independence during the Hussite Wars, where the Hussites took on the Pope (several Popes declared no less than five Crusades against the Hussite heretics), the Holy Roman Emperor, and the King of Bohemia in the Hussite Wars - and ultimately won, forcing the Catholic Church to recognize the Moravian Church.
(This is something of a simplification of a very complicated conflict, because there was also a civil war between the more conservative and more radical Hussites that saw the radicals militarily defeated and their church disbanded.)