Definition: In this task, you need to generate an appropriate title for the given summary of some paragraph. The generated title must be short and should include the main topic of the given text. Your summary should be less than 20 words long.
Input: For decades the BBC denied that job applicants were subject to political vetting by MI5. But in fact vetting began in the early days of the BBC and continued until the 1990s. Paul Reynolds, the first journalist to see all the BBC's vetting files, tells the story of the long relationship between the corporation and the Security Service.

The vetting files: How the BBC kept out ‘subversives’