Which of the following is not a leading case on immunity of trade unions from criminal proceedings?

Pipraich Sugar Mills Ltd. v. Pipraich Sugar Mills Mazdoor Union (AIR 1957 SC 95) is a landmark Supreme Court decision on the bona fide closure of an industry and whether an industrial dispute can arise after closure; it does not deal with the immunity of registered trade unions from criminal proceedings. By contrast, R.S. Ruikar v. Emperor (AIR 1935 Nag 149), Jay Engineering Works Ltd. v. State of West Bengal (AIR 1968 Cal 407), and Standard Chartered Grindlays Bank Ltd. v. Grindlays Bank Employees are leading decisions examining the scope and limits of statutory immunities granted to registered trade unions, their office-bearers, and members (now governed by Sections 16 and 17 of the Industrial Relations Code, 2020, formerly Sections 18 and 17 of the Trade Unions Act, 1926), holding that such immunity covers legitimate trade union activities and does not shield substantive criminal offences such as wrongful confinement (gherao) or unlawful obstruction.