What's the meaning of purple infiltration level bar?

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Thanks.

Why is it showing the required Intel of the current task? You can't start another one?

Or is it the minimum Intel you keep and the blue/green part of the bar goes down after some time? Need to take a closer look again.
 
Minimum infiltration required is the correct way to put it, something I didn't realize at first. Your infiltration level has a maximum so for example, gathering intelligence provides +5 infiltration level for 10 years and stacks up to +20 and provides 5-10 Intel upon completion and -5 infiltration level.
If you are noticing decreases it means infiltration is less than Intel.