Can you hire a lawyer against another lawyer?

I know that they all live in a lawyers universe and it's all about 'connections' so I'm wondering if I hired another lawyer from a separate firm to get advice and maybe act against another firm because I do not trust them, can I trust the other lawyer or would I be putting them in a situation or maybe they all just support eachother the way alot of corrupt police support eachother? Unfortunately with lawyers you cant tell if they are one of the good ones or not until it's too late.
I cant find any info on this anywhere online