The article says that was divisions within the followers of The Bab. But if you want to get nit picky... I'm sure you been told and have a reasonable explanation for all this. Here's what is says about what happened when Baha'u'llah died...
Division amongst the followers of Bahá'u'lláh
The
second major division arose amongst the Followers of Bahá'u'lláh was after his death. Mirza Husain Ali (Bahá'u'lláh) expired in May 1892 leaving behind 4 sons and 3 daughters. A severe dispute of successorship erupted among the brothers. The eldest, Abbas Effendi claimed to be the rightful successor in view of the continuation of divine inspirations. However, his brothers Mirza Mohammed Ali, Mirza Badiullah and Mirza Ziaullah and many other Bahá'ís countered that the Divine inspiration ended since "Bahá'u'lláh" had himself written in "Al Aqdas" that anyone who claims thus (Divine inspiration) before the completion of 1,000 years of Bahá'ísm, indeed was a liar and that this claim was false. Nevertheless Abbas Effendi was able to tide over these problems very soon. He assumed the title of "Abdu'l-Bahá" and called his followers as "Sabiteen" (Steadfasters) and followers of his younger brother as "Naqizeen" (Covenant Breakers).
The followers of Mirza Mohammed Ali call themselves as "Unitarian Bahá'ís".
Division amongst the followers of Abdu'l-Bahá and Shoghi Effendi
One of the biggest controversies in Bahá'í history was rapidly fading out of the memory of the mainstream Bahá'í community. But thanks to the
internet and its vast repository of free-flowing information and the
court case done by the Haifa-based Bahá'í Faith on two of its denomination, the Haifa-based Bahá'í Faith will never be able to cover up what happened in 1957, despite their best efforts to ignore it and minimize its importance. In that year, The Bahá'í Faith lost what was supposed to be its unending chain of infallible spiritual authority when the first Guardian of the faith died without clearly designating any successor.
Bahá'u'lláh had appointed his son Abdul-Baha to succeed him as leader of the religion and inspired interpreter of Bahá'í scriptures and teachings. Abdul-Baha continued this successorship by establishing a position called the Guardian of the Cause of God, to which he appointed his grandson Shoghi Effendi Rabbani in his will and commanded him to appoint his own successor during his lifetime. Shoghi Effendi developed complex theories of a "world order of Bahá'u'lláh" and appointed two main institutions of Bahá'í leadership, the International Bahá'í Council and the Hands of the Cause.
When Shoghi Effendi suddenly died, childless and without leaving any known will, a power struggle ensued. The Hands of the Cause, led by Shoghi Effendis widow Ruhiyyih Khanum, asserted a claim to be some form of temporary collective Guardianship. The Council President, Charles Mason Remey, claimed to be the second Guardian using arguments from the first Guardians writings on Bahá'í religious administration to support his case. The Hands used other arguments from Bahá'í sacred texts to repudiate him, and they ended up convincing a majority of Bahá'ís in the world to follow their own claim of authority rather than Remeys.
In 1963 they established their Universal House of Justice (UHJ) as the international ruling body at the "Bahá'í World Center" in Haifa, despite questions about whether this institution could be legitimately constituted without a Guardian as the head member.
The National Spiritual Assembly of the Bahá'ís of France, Pakistan, India and a couple of more countries followed the claim of Mason Remey to be the second Guardian. All its members were summarily excommunicated by UHJ. In Reaction Mason Remy ex communicated all the Hands of Cause calling the Wife of Shoghi Effendi as ARCH COVENANT BREAKER
A lot of Bahá'ís simply left the faith in disappointment, realizing that a major leadership dispute ruins the credibility of a religion that prides itself on unity and seeks to rule the world. Among those Bahá'ís who remained committed to their faith, a schism developed, and the minority of Bahá'ís who followed Remey and rejected the "Haifan" UHJ persist to this day. They have had limited success attracting new converts, though the advent of the internet has helped their efforts somewhat in recent years. They are commonly known as Guardianists, emphasizing their belief in the continuation of the living Guardianship as an essential part of Bahá'í Faith. " Most of them currently follow Joel Bray Marangella, who claims to be the third Guardian. Some others follow Guardian-claimant Jacques Soghomonian instead.
The Haifan Bahá'í Faith stigmatizes the Guardianist Bahá'ís as "Covenant-breakers" and demands that all members of their organization should shun them, Then there is a pain of shunning if they refuse to shun. Haifan Bahá'ís can be severely punished just for reading Guardianist literature. Both the Haifans and the Guardianists believe that membership in their group is the only way to be a true Bahá'í; both assert that their leaders are infallible, despite the lack of solid evidence from Bahá'í scripture to support their claim; and
both teach that one day the whole world should be governed by a Bahá'í theocracy led by their particular organization, even though their own religion is not unified under one authority.
I needed some relief.