There are n number of ways to cheat minority shareholders. Some of them are ugly but some have grey color.
Steps like insider trading, rumor mill, extrapolation of current earnings, boosting future, trading in secondary markets, non-core activity, dealing only with promotor group companies are some ugly deeds.
but steps like preferancial allotements (at cheap prices), delisting (and giving peanuts as comparied to burrent book value), owning IPR with group companies are some grey deeds.
I see lots of promotors acting on first list but there are quite few companies who act on second list. It is easy to identity ppl from first list but second list promotor are most dangerous ppls.
Biggies like REL, Bharti, RIL are among second list promotors. This list is quite big.
Quarel among Ambanis were motto to get preferencial offer/ market purchases at cheap prices. All that saga was done in a very polished way.
Bharti delisted earlier company which use to own current listed company and gave peanuts to shareholders of that time.