Churchill Security is based in Chorley and employs more than 160 people in the UK, including Cardiff Bay, Cheltenham, Watford, Milton Keynes, Bromley, Abingdon and London.
The company is forcing their workforce to download special software onto their phones which allows their every location to be tracked.
GMB demanded: ‘Churchill must stop forcing totalitarian technology on security staff.’
The company has written to employees saying they are ‘expected’ to use the application which will ‘track locations’ and ‘update you of shift changes’.
The letter adds: ‘It is the employee’s responsibility to ensure they have a working mobile phone at all times … disciplinary action may be taken due to an employee failing to comply with mobile phone policies.’
Roger Jenkins, GMB National Officer, said: ‘This is appalling behaviour from a company trying to play big brother to hard working security guards.
‘Our members are performing a difficult, dangerous job with enormous responsibility. These are the people we rely on, the first on the scene after atrocities like Westminster Bridge or the Manchester Arena.
‘What they don’t need is employers making their job even harder, expecting them to download spy software onto their personal phones and tracking their every move.
‘GMB calls on Churchill to do the decent thing and stop trying to force this totalitarian technology on security staff.’
Lively PCS picket line outside the Department of Business, Energy and Industrial Strategy yesterday morning