The Adventures of Robin Hood was produced by Hannah Weinstein, who had left-wing political views. The series was explicitly created by Weinstein to enable the commissioning of scripts by blacklisted American writers.[10] Among these were Ring Lardner Jr., Waldo Salt, Robert Lees, and Adrian Scott. Howard Koch, who was also blacklisted, served for a while as the series' script editor. The blacklisted writers were credited under pseudonyms, to avoid the attention of studio executives.
they did have a point:
https://en.wikipedia.org/wiki/The_Adventures_of_Robin_Hood_(TV_series)#Production_details
The Adventures of Robin Hood was produced by Hannah Weinstein, who had left-wing political views. The series was explicitly created by Weinstein to enable the commissioning of scripts by blacklisted American writers.[10] Among these were Ring Lardner Jr., Waldo Salt, Robert Lees, and Adrian Scott. Howard Koch, who was also blacklisted, served for a while as the series' script editor. The blacklisted writers were credited under pseudonyms, to avoid the attention of studio executives.