Punjabi actor Deep Sidhu and farmers' leader Baldev Singh Sirsa are among 40 people summoned by the National Investigation Agency (NIA) for questioning in a case related to the banned outfit Sikhs For Justice. The actor, who has backed the farmers protesting against the centre's contentious agriculture laws, has been asked to appear before the anti-terrorism agency at its Delhi headquarters today. The others who have been summoned include officials of non-profit Khalsa Aid.