The 4th Marquess of Salisbury was also initially involved in the League. According to Sir Oswald Mosley, he and Leslie Hore-Belisha were also active members.
The text states that the 4th Marquess of Salisbury was a member of the League from its inception, as confirmed by Sir Oswald Mosley. He and Leslie Hore-Belisha were also actively involved in the League's activities.