well @Chevdove You say two things.
Between Douglass side Garrison is one thing. Between Garrison and the "anti slavery movement" is another.
I will start with Douglass and Garrison.
What separated the two , philosophically?
Douglass opposed slavery but he loved the USA, he was a firm federalist. Douglass was a huge supporter of involvement in government in the usa, for he thought the system of government in the usa is of a quality that it can improve itself to the betterment of all humanity. Sequentially, Douglass accepted the idea of gradualism.
Garrison opposed slavery but he though the government of the usa, the federal government was purely dysfunctional. What do I mean by purely dysfunctional? Garrison's problem was deeper than elected officials, he felt advocacy to issues like abolistion or women's rights was impossible through government. To Garrison government didn't need time to change, and could change at any moment.
That is the key to Douglass friction side Garrison.
Garrison to the anti slavery moment is where the persecution to him comes from.
Yes Garrison was anti slavery, or abolition.
But, he opposed participation in the usa government or more importantly, the idea that the usa government is a positive institution. to him the usa federal government was a sham, and that is probably a nice word. So, all the anti slavery or abolition folks who wanted laws to change or legal systems to be molded despised him.
He opposed partiality. He wanted women, all women, to have the full right to vote at the same time as all blacks. Again, the anti slavery or abolition folks who accepted the rights of black men to vote but not of women of any race to vote to him was a betrayal of supposed support for anti slavery. so those who accepted slavery in the confederate states or accepted inequality in rights opposed him.
And he also was anti-jewish, he thought jews, any phenotype, are a people whose actions led and lead to their own downfall throughout history. And as the white jewish community became a huge financier of many non white male movements in the usa and added to their financing a pro jewish stance in organizations.
so all together he had many detractors in movements during his life and even moreso after his life.
Look at the black community in the year 2023. Black anti government folk, Black anti incrementalist, Black anti jewish folk are each minorities in the black community in the USA. But they exists. In defense of you, don't be confused, the truth is, the USA is a country of individualism. The main problem with individualism is by default it is anti group or collective. The best thing for Individualism is for individuals to relinquish group or collective affiliations. But in the usa, a government started by groups against groups, It can be argued that individualism is naturally dysfunctional in the usa. and that is part of what garrison meant. The USA government design can be argued is pro slavery by design. I am not suggesting I am supporting this idea fully but it has merit.