Altria Group Stock (Mo)?

Question

why that in early April the cigarettes company Mo. stocks dropped from $75 to $20 in ONE DAY

Answer 1

It was when they spun off PM (Phillip Morris International) as a special dividend.

PM International was driving the growth of Altria for a while, as domestic consumption of tobacco has been shrinking in recent years.

In developing markets, though, American cigarettes are a luxury item, and Carolina cigarettes are regarded like Cuban cigars.  Overall, tobacco consumption in China has doubled in less than a decade, and other developing markets are growing fast, too.

Answer 2

It did split in that month to MO and PM; MO was $20 and PM $50.

Answer 3

looks like a stock split to me.  If you were invested in it you would have not lost money.  You would have just got more shares at a lower price.