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By prohibiting bills of attainder, the Constitution is prohibiting finding someone guilty without a trial. By prohibiting the making of ex post facto laws, the Constitution is prohibiting the making of retroactive laws (e.g., you do something that is legal, a law is passed making it retroactively illegal, and you get arrested for doing it).
A law that retroactively changes the legal consequences (or status) of actions committed or relationships that existed prior to the enactment of the lawAdded: In plain English - it defines a law that retroactively makes something illegal. Although not all countries have such a prohibition, in the US, they are forbidden by Article 1 Section 9 of the United States Constitution.
The constitution prohibits making a law ex post facto because it would retroactively change the rules of evidence in a criminal case, retroactively after the definition of a crime, increase punishment retroactively or punish conduct that was legal when committed.
Ex post facto laws are laws that act retrospectively. The law changes the legal consequence of an action that was committed before the enactment of the law. For example, an action that was not criminal in 1990 may be regarded as a crime if new legislation is passed to ban the action.
not that i know. freedom of speech:]