"Anti-Baha'i" works by different groups

From the early decades of this century, this stream of Muslim anti-Bahá'í polemic has been joined a rising amount of Christian anti-Bahá'í polemic. This was initiated by Christian missionaries in Iran such as S.G. Wilson and J.R. Richards, but has been extended in recent years to Christian theologians especially those from a Protestant fundamentalist background. Polemic from other religious groups against the Bahá'í Faith has not thus far been of major importance although it is anticipated that this may increase in the future.

In addition, there have been attacks on the Bahá'í Faith made by secular opponents. The largest volume of such material was generated in the Soviet Union as part of the communist anti-religion drive.

Also to be included in this category are the works of "Covenant-Breaker" (q.v.) groups. These begin with Azali polemic in the 19th century such as the Hasht Bihisht of Mirza Aqa Khan Kirmani. For other examples see Ahmad Sohrab, Broken Silence (1942); and Herman Zimmer, A Fraudulent Testament devalues the Bahai Religion into Political Shoghism (1973).

Lastly, there remain a number of works written by apostates. 'Abdu'l-Husayn Avarih, for example, was a Bahá'í who wrote an important history of the Bahá'í Faith, the Kavakibu'd-Durriyyih. He later left the Bahá'í Faith and wrote the Kashfu'l-Hiyal. Other examples include the works of Subhi and Niku.

-Moojan Momen (Baha'i scholar loyal to the Haifa based Administrative order)

https://bahai-library.com/momen_encyclopedia_scholarship_survey