Enlightening piece by Stephane Lacroix in FP on the Saudi Brotherhood(s):
From the days of Hassan al-Banna, the Saudi monarchy made it clear that it wouldn't allow the Brotherhood to establish a section in the kingdom. Yet from the late 1960s onward, different groups of Saudis influenced by Egyptian and Syrian Brotherhood exiles started creating local semi-clandestine organizations claiming an affiliation to the MB. A sign that this was the result of a bottom-up dynamic, not a top-down creation, is that four such distinct organizations saw the light at about the same time: one in the western province, called the Brotherhood of the Hejaz (ikhwan al-Hijaz); and three in the central region -- two named after their alleged founder, the Brotherhood of al-Sulayfih (ikhwan al-Sulayfih) and the Brotherhood of al-Funaysan (ikhwan al-Funaysan), and one called the Brotherhood of Zubayr (ikhwan al-Zubayr) because it was established by Saudis whose families had lived in Zubayr, in Southern Iraq. Although the four groups attempted to coordinate their activities and saw themselves as part of one broader entity, they never managed to formally merge.
These groups of Saudi Brothers maintained links to the MB in Egypt and elsewhere, but, because of the sensitivity of the topic, those links remained loose and were never formalized. For instance, Saudi Brothers sometimes attended meetings of the Brotherhood's international organization in the 1980s, but officially they did so in their individual capacity, not as representatives of their organization. Also, Saudi Brothers generally did not pledge allegiance to the supreme guide in Cairo, as members of the Brotherhood are usually required, because, as Saudi citizens, they were already bound by an oath to the Saudi King. In terms of ideology, Saudi Brothers were also quite different from their counterparts elsewhere: although they did read Hassan al-Banna, Sa‘id Hawwa, and Sayyid Qutb, they were also heavily influenced by Salafi authors whom they quoted on issues of creed and on certain issues of fiqh.
If and when Syria is run by the MB, and if and when the MB strengthen their position in Jordan, the al-Sauds will have to start really worrying about their local MB.