Question:
Are you allowed to say On a Jew that is dead already Yimach shimo even if he was a big rosho
Answer:
Without getting into the topic or who “earns” this title, if a person is one that indeed can be called this,it also applies after they die. There were a number gedoilim that used this term on Moses Mendelson is”v, the starter of the reform movement. As a side point why should there be a difference between before or after he dies?