The ISU is a British trade union representing some of the operational staff in the Borders, Customs and Immigration functions of the Home Office.[1][2][3][4][5][6][7]
The ISU is politically independent and not a member of the Trades Union Congress. PCS, the SCPS's successor, sees ISU as a yellow union, as some senior managers encouraged its splitting off, although its independence has been certified by the Certification Officer.[10][11]
Membership of the union reached 4,263 in 2006,[11] but, in common with all Civil Service unions, fell after the ending of payroll wage check-off (subscriptions automatically deducted where workers have ticked to confirm they wish to be in any recognised union to their employer) in 2015.[12] It declined to 3,018 in that year.[13] In 2020, membership stood at 3,043.[14] By 2022, ISU membership stood at 3,803. [15]
The ISU does not generally take industrial action.[16] In 2012, ISU members followed other public sector unions in agreeing to strike against changes to civil service pensions.[17]