My distant relations don't come under the category of criminal (much) or violent but under "dirty rotters!"
Bankrupt, left UK and previously prosperous wife and nine children in poverty, debunked to USA(?), never heard of again.
Son advertised for Dad in USA newspapers, then left HIS wife for USA, married another woman there bigamously and sometimes swopped identities with a cousin who was also running from the same UK city who had ended up in Canada..... First (legal) wife died in Vancouver many years after he left her, had she followed his trail hoping to reunite, it was a long time before she gave in and called herself a widow!
At one time I thought it was the same person with two families as they both worked for the railways but no...they were two dirty rotters. There are probably at least two very respectable families in Canada and USA who are descended from this lot.
It's taken me years to unscramble these DR's so maybe the descendants will never get to the bottom of the mysteries.
Gen in NBL England