The match referee David Foster included the incident in his post match report.
The exciting 3-3 draw at Glanford Park was marred by trouble as several Swindon fans clashed with stewards in the AMS stand.
United's chief executive Jamie Hammond said: "I spoke to my counterpart [at Swindon] and they wanted to know why they'd been ejected with a view to taking action."
The club have made no further comment.