By all means, show us some accounts. Let's see how you "know they did" and then we'll see whether we can "Dismiss" them or not. But if you're not going to present them just because you're afraid I'll "dismiss them out of hand", well just keep in mind that I'm not exactly the only one here. I would love to see some accounts of Arians violently attempting to suppress the Trinitarians around the time. If you're talking about the Vandals and Goths, I do believe they were attacked first and that was more of a warfare issue.
From the life of St. Antony the Great:
These things the old man saw,
and after two years the present [16] inroad of the Arians and the plunder of the churches took place, when they violently carried off the vessels, and made the heathen carry them; and when they forced the heathen from the prisons to join in their services, and in their presence did upon the Table as they would. Then we all understood that these kicks of the mules signified to Antony what the Arians, senselessly like beasts, are now doing. But when he saw this vision, he comforted those with him, saying, 'Be not downcast, my children; for as the Lord has been angry, so again will He heal us, and the Church shall soon again receive her own order, and shall shine forth as she is wont. And you shall behold the persecuted restored, and wickedness again withdrawn to its own hiding-place, and pious faith speaking boldly in every place with all freedom. Only defile [17] not yourselves with the Arians, for their teaching is not that of the Apostles, but that of demons and their father the devil; yea, rather, it is barren and senseless, and without light understanding, like the senselessness of these mules.'
And an account showing Eusebius of Nicomedia orchestrating the martyrdom of Paul of Constantinople.
And I suppose no one is ignorant of the case of Paul
[19], Bishop of Constantinople; for the more illustrious any city is, so much the more that which takes place in it is not concealed. A charge was fabricated against him also. For Macedonius his accuser, who has now become Bishop in his stead (I was present myself at the accusation), afterwards held communion with him, and was a Presbyter under Paul himself. And yet when Eusebius with an evil eye wished to seize upon the Bishopric of that city (he had been translated in the same manner from Berytus to Nicomedia), the charge was revived against Paul; and they did not give up their plot, but persisted in the calumny. And he was banished first into Pontus by Constantine, and a second time by Constantius he was sent bound with iron chains to Singara in Mesopotamia, and from thence transferred to Emesa, and a fourth time he was banished to Cucusus in Cappadocia, near the deserts of Mount Taurus; where, as those who were with him have declared, he died by strangulation at their hands. And yet these men who never speak the truth, though guilty of this, were not ashamed after his death to invent another story, representing that he had died from illness; although all who live in that place know the circumstances. And even Philagrius
[20], who was then Deputy-Governor
[21] of those parts, and represented all their proceedings in such manner as they desired, was yet astonished at this; and being grieved perhaps that another, and not himself, had done the evil deed, he informed Serapion the Bishop, as well as many other of our friends, that Paul was shut up by them in a very confined and dark place, and left to perish of hunger; and when after six days they went in and found him still alive, they immediately set upon the man, and strangled him. This was the end of his life; and they said that Philip who was Prefect was their agent in the perpetration of this murder. Divine Justice, however, did not overlook this; for not a year passed, when Philip was deprived of his office in great disgrace, so that being reduced to a private station, he became the mockery of those whom he least desired to be the witnesses of his fall.
-
Source
Also see that source for other examples of how Arians (not Semi-Arians, but Arians proper) drove out bishops and other clergy.
Accordingly Constantius at once writes letters, and commences a
persecution against all, and sends Philagrius as Prefect with one Arsacius an eunuch; he sends also Gregory with a military force. And the same consequences followed as before. For gathering together a multitude of herdsmen and shepherds, and other dissolute youths belonging to the town, armed with swords and clubs, they attacked in a body the
Church which is called the
Church of Quirinus ; and some they slew, some they trampled under foot, others they beat with stripes and cast into
prison or banished. They haled away many
women also, and dragged them openly into the court, and insulted them, dragging them by the hair. Some they proscribed; from some they took away their bread for no other reason, but that they might be induced to join the
Arians, and receive Gregory, who had been sent by the Emperor. -
Source
