Sir Richard Dawson Bates

From the History of Ireland website 

With Sir Richard Dawson Bates, all the old internecine Irish conflicts, resentments and fears resurface, wrapped up in a complex and committed personality that could never remotely be described as tolerant. A committed Ulster Unionist, Dawson had roles to play in the organization of Ulster Day and the signing of the Ulster covenant in 1912, as well as in the Larne gun-running operation of 1914, when the Unionists smuggled in arms to be used if necessary in fighting against the imposition of home rule.

In 1918, Dawson, along with Sir Edward Carson, helped establish the Ulster Unionist Labour Association, a Protestant, and specifically anti-socialist and anti-republican trade union movement. This sounds contradictory and almost certainly was. 

What the Association did help breed however was sectarianism. 
As the Belfast economy went into a downturn, the Protestants singled out the Catholics for moving into Protestant areas, and taking away jobs. Sectarian tension and retaliation followed, and local protection militia were formed. And of course as if this was not enough, the 1917 Russian revolution had now struck enough fear into establishment figures like Dawson Bates, that those with vaguely socialist notions were also to be excoriated as purveyors of division and disunity. The Wikipedia entry for Dawson Bates (albeit hardly neutral in discourse) portrays him touring the country intent on portraying all Roman Catholics as traitors. In office, he was accused of gerrymandering and intervening to ensure that Protestants who attacked Catholics were not punished. He was a keen proponent and supporter of the Civil Authorities Act of 1922, which restricted civil liberties and passed all kinds of arbitrary powers into the hands of the authorities, which he was then only too happy to use.