You should probably read his biography then because you miss the part that starts:
>"Traveling there in secret, Mandela ..." - http://en.wikipedia.org/wiki/Nelson_Mandela#Umkhonto_we_Sizw...
He was arrested after sneaking back into S. Africa, after sneaking out of S. Africa, when someone tipped off the government about his location (he went dark to avoid capture, he was in hiding when they arrested him). He attempted to evade the S. African government and clearly would have avoided arrest by fleeing the country if possible. Note that one of the things he was charged with was "leaving the country without permission".
And just for the record Loki was captured. The imprisonment of Loki is an extremely important aspect of the mythology of Loki which should not be ignored in attempting to find modern analogues.
>The narrative continues that Loki was bound with the entrails of his son Nari, and his son Narfi changed into a wolf. Skaði fastened a venomous snake over Loki's face, and from it poison dripped. Sigyn, Loki's wife, sat with him holding a basin beneath the dripping venom, yet when the basin became full, she carried the poison away; and during this time the poison dripped on to Loki, causing him to writhe with such violence that all of the earth shook from the force, resulting in what are now known as earthquakes. - http://en.wikipedia.org/wiki/Loki