I was wondering is there anyone who knows a list of 19th and 20th centry abolishonists?

Answer 1

Here's a couple of wikipedia entries :-

The first is 'notable abolitionists',
The second is 'notable opponents of slavery' (not all abolitionists)

Note - Your spelling 'abolishonists' is incorrect. It should be 'abolitionists', which is probably why you're having trouble finding the info that you want.

I hope this helps.