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After discussing everything from female nipple censorship to awareness of transgender issues, noted feminist Matt McGorry has weighed in on a new social issue: the Black Lives Matter movement.

The movement was originally born from outrage over the number of black Americans killed every year by police, and some have responded by using the phrase “All Lives Matter” instead. The Orange is the New Black and How to Get Away With Murder actor took to Twitter and Instagram to show his support for “Black Lives Matter” and discuss how using the phrase “All Lives Matter” undermines the movement’s effectiveness.

“For people who think they are being more inclusive by saying #AllLivesMatter in response to #BlackLivesMatter, they are in reality (un)consciously undermining the purpose of the moment because THIS particular movement is about SPECIFIC issues, as any decently effective movement is,” McGorry tweeted.

Read McGorry’s entire string of tweets below.