red currant aphids or currant blister aphids make these galls

red currant aphids or currant blister aphids make these galls, I removed the leaves as a precaution but otherwise the bush is quite healthy. I enjoyed this reference that encourages you not to spray insecticides for these relatively harmless guys because aphids are an important part of the food web and it’s ok to have some in your garden. https://www.rhs.org.uk/biodiversity/currant-blister-aphid