LOL, I wouldn’t have known all that had it not been for Adam Sandler’s “Hanukkah Song”.
The story is that Mission:Impossible was filming at Desilu at the next studio when season 1 star Steven Hill (a devout Orthodox Jew) would not work on Saturday. Hill went through the studio lots looking for other Jews to join him, and William Shatner went the Desilu executives complaining that Hill was pestering him and Nimoy.
Hill was eventually fired from Mission:Impossible and dropped out of acting for 10 years.
-PJ