Etymology
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roundup (n.)

also round-up, by 1869 in the cattle drive sense; from verbal phrase round up "to collect in a mass" (1610s; specifically by 1847 of livestock in grazing areas, "drive or bring together in close order"); see round (v.) + up (adv.). The original notion is presumably "heap or fill so as to make round at the top." The meaning "summary of news items" is recorded from 1886.

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Definitions of roundup

roundup (n.)
the activity of gathering livestock together so that they can be counted or branded or sold;
roundup (n.)
a summary list; as in e.g. "a news roundup";
roundup (n.)
the systematic gathering up of suspects by the police;
a mass roundup of suspects
From wordnet.princeton.edu