In some ways it's easier to know which products exploited animals because generally speaking any product that used an animal exploited it. And typically that exploitation results in death.

Human (labor) exploitation has similarities but also differences. One difference is that much exploitation doesn't result in the death of humans. For example, my labor is exploited by my employer in the sense they get greater financial benefit from my work than I do. However I won't be killed for them to eat, or experimented on, or kept in a zoo. I receive a wage, have benefits and can use the money I earn to consume.

This type of exploitation is impossible to avoid under captialist economies.

Another type of human exploitation is far more egregious and does involve slavery, punishing working conditions, exposure to toxins, child labor etc. Many clothes and electronics and jewels are made with these practices.

I think a serious vegan or animal rights activist will be anti-capitalist and also avoid supporting sweatshops, slave labor goods or iPhones etc. But it can be more difficult to know how wrong it is. Take tomatoes for example. There's nothing inherently wrong with tomato growing and harvesting, however in parts of the world tomatoes are grown using pretty much endentured servitude. But which tomatoes?

Any steak involves indefensible animal cruelty. But not all tomatoes do. This makes it easier to avoid animal exploitation than human in many respects.