This logline is too long and has too many unnecessary descriptions.
The description "...former contender..." is confusing when read first up - contender to what? The whole boxing back story needs to be cut from the logline as it has no bearing on the plot.
"...Aryan Brotherhood..." can also be dropped - as long as you describe the antagonist as a kingpin the reader gets the necessary information, the particular type of gangster is irrelevant at this stage.
"...mother of his unborn child..." - is a long way of saying 'pregnant girlfriend'.
"...one that comes with the ultimate price..." - is a long way of saying 'life threatening'.
Whatever the job is, that the kingpin wants him to do, needs to be described in the logline. This is his main action which will constitute most of act 2, and needs to be described in more detail.
In essence, the story is about a former boxer who needs to? save his pregnant girlfriend - the stakes are clear and high. Focus on this and this alone in the logline and delegate all back story, bells and whistles included, to the synopsis.
For example:
After a powerful kingpin threatens to kill his pregnant girlfriend a former boxer must risk his life running drugs across the border for the mob to save her life.
However, I believe that DPG made a strong argument when saying he is passive. Best if you give the MC a better course of action than following through on the kingpins demands.