JPMorgan employees describe growing ‘paranoia’ as the company tracks their office attendance, calls, calendars, and more — with one worker even installing a ‘mouse jiggler’ to evade ‘Big Brother’

• JPMorgan has developed a powerful data-collection tool to monitor its employees’ activities.

• Employees at America’s largest bank fear what the data collection could mean for their jobs.

• One staffer described a workplace where terms like “Big Brother” and “1984” have become commonplace.

At JPMorgan Chase, employees say watchful eyes are…