In 1789 he produced a plea for religious toleration in the form of a five-act tragedy in verse, Jean Calas.
In his next work, the injustice of the disgrace cast on a family by the crime of one of its members formed the theme of Les Dangers de l'opinion (1790).
It is by his Ami des lois (1793) that Laya is best remembered.
Laya went into hiding, and several persons convicted of having a copy of the obnoxious play in their possession were guillotined.
At the end of the Terror Laya returned to Paris.