In the U.S., navigating STEM with marginalized identities can affect scientists' communication practices. There is a critical need for science communication training that accounts for the historical oppressions, discriminations, and inequities of marginalized communities. In this paper we analyzed 712 participant responses from ReclaimingSTEM science communication workshops to understand how marginalized scientists' identities influence their science communication practices. We found that participants' experiences of exclusion and hostility in STEM spaces influenced their engagement in science communication. Scientists from marginalized backgrounds aim to change the culture of STEM through their communication efforts to promote a sense of belonging for their communities.