Possible Clues:

• This person's set up permits for settlers
• All available money and permits for people on the move
• Travellers needing permits to go on motorway
• Endless Massachusetts Institute of Technology research aids for newcomers
• ''Grapes of Wrath'' characters
• People who resettle
• They move from country to country
• Birds avoiding the last half of mighty storms
• "The Grapes of Wrath" workers
• Around the end of spring martins may be these