Welsh Defence League protest against Islamic extremism onlookers were confronted with scenes of jeering men giving Nazi salutes.
It was the first time the newly-formed group have been out on the streets in Wales.
At the gathering in Swansea, a 25-year-old man was arrested for a racially-aggravated public order offence.
The controversial march had sparked a counter-demonstration, with about 200 protesters occupying the city centre.
A heavy police cordon on either side of Castle Street in Swansea city centre kept the two groups apart.
Grown men were seen making Nazi salutes in front of small children.
This weekend (24th October) will see the Welsh Defence League hold a protest in Newport. SRtRC were due to hold an Anti Racist stance of action in the European Fortnight of Action before a Newport County AFC match against Thurrock which the action has been cancelled with advice from the police due to the protest by the WDL.
SRtRC are re-arranging the stance of action for a further date.
Source: Wales Online