a) they string along a multi-year investigation of Manafort, probably just so they can use him as bait for FISA warrants and other eavesdropping;
b) they exceed their authority vis a vis the scope of the 'Russia' investigation;
c) they withhold exculpatory evidence, as they have in almost all other high profile Federal cases;
d) they accuse Manafort of 'witness tampering' to force him to cut-off all business contacts (or frighten off those contacts), driving Manafort's business into the ground;
e) they have his bail denied on the same trumped up charges;
All to get him to turn on Trump.
And all apparently 'legal' according to the judge in the case.
Manafort should have fled the country and asked for political asylum.
You need to add they do this to intimidate anyone else thinking about helping someone else challenge the establishment.
At least Trump is President, which was helpful to Scoter Libby unlike the prior Republican President who was fond of reaching across the aisle and not criticizing Democrats.