A complete series of seminars on the topic, "How to Organise an Underground Church," is available for free audio download at this site:
http://www.sermonindex.net/modules/mydo ... php?cid=50
The series of talks is given by Rev. Richard Wurmbrand who was kept in solitary confinement, and subjected to years of beatings, psychological tortures and brainwashing techniques, and also drugging with the aim of weakening his will and resolve and breaking his faith in God. These attempts failed. Though he is a Lutheran, there remains much we can learn from this man.
One day such knowledge may be essential to our survival.
PS. I found this short summary of some details of his experiences in the Romanian Prison System:
Wurmbrand, who passed through the penal facilities of Craiova, Gherla, the Danube-Black Sea Canal, Văcăreşti, Malmaison, Cluj, and ultimately Jilava, spent three years in solitary confinement. His wife, Sabina, was arrested in 1950 and spent three years of penal labour on the Canal.
Pastor Wurmbrand was released in 1956, after eight and a half years, and, although warned not to preach, resumed his work in the underground church. He was arrested again in 1959, and sentenced to 25 years. During his imprisonment, he was beaten and tortured.
Eventually, he was the recipient of an amnesty in 1964.
Wikipedia says this about him in their introduction to a rather lengthy and interesting biography:
Richard Wurmbrand (March 24, 1909 – February 17, 2001) was a Romanian Christian minister of Jewish descent. He was a youth during a time of anti-Semitic activity in Romania, but it was later, after becoming a believer in Jesus Christ as Messiah, and daring to publicly say that Communism and Christianity were not compatible, that he experienced imprisonment and torture for his beliefs. After serving five years of a second prison sentence, he was ransomed for $10,000. His colleagues in Romania urged him to leave the country and work for religious freedom from a location less personally dangerous. After spending time in Norway and England, he and his wife Sabina, who had also been imprisoned, emigrated to America and dedicated the rest of their lives to publicizing and helping Christians who are persecuted for their beliefs. He wrote more than 18 books, the most widely known being Tortured for Christ. Variations of his works have been translated into more than 60 languages. He founded the international organization Voice of the Martyrs, which continues to aid Christians around the world who are persecuted for their faith.
See this link for full bio at wiki: