4.1M accounts from Avvo (avvo.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesPasswords
In approximately December 2019, an alleged data breach of the lawyer directory service Avvo was published to an online hacking forum and used in an extortion scam (it's possible the exposure dates back earlier than that). The data contained 4.1M unique email addresses alongside SHA-1 hashes, most likely representing user passwords. Multiple attempts at contacting Avvo over the course of a week were unsuccessful and the authenticity of the data was eventually verified with common Avvo and HIBP subscribers.
Source: Have I Been Pwned (CC BY 4.0)