diff --git a/.idea/sqldialects.xml b/.idea/sqldialects.xml
index aee3c04..cdd8fd1 100644
--- a/.idea/sqldialects.xml
+++ b/.idea/sqldialects.xml
@@ -2,6 +2,7 @@
 <project version="4">
   <component name="SqlDialectMappings">
     <file url="file://$PROJECT_DIR$/src/FederationServer/Classes/Managers/AuditLogManager.php" dialect="MariaDB" />
+    <file url="file://$PROJECT_DIR$/src/FederationServer/Classes/Managers/BlacklistManager.php" dialect="MariaDB" />
     <file url="file://$PROJECT_DIR$/src/FederationServer/Classes/Managers/EntitiesManager.php" dialect="MariaDB" />
     <file url="file://$PROJECT_DIR$/src/FederationServer/Classes/Managers/EvidenceManager.php" dialect="MariaDB" />
     <file url="file://$PROJECT_DIR$/src/FederationServer/Classes/Managers/FileAttachmentManager.php" dialect="MariaDB" />
diff --git a/src/FederationServer/Classes/Managers/BlacklistManager.php b/src/FederationServer/Classes/Managers/BlacklistManager.php
new file mode 100644
index 0000000..416c661
--- /dev/null
+++ b/src/FederationServer/Classes/Managers/BlacklistManager.php
@@ -0,0 +1,229 @@
+<?php
+
+    namespace FederationServer\Classes\Managers;
+
+    use FederationServer\Classes\DatabaseConnection;
+    use FederationServer\Classes\Enums\BlacklistType;
+    use FederationServer\Exceptions\DatabaseOperationException;
+    use FederationServer\Objects\BlacklistRecord;
+    use InvalidArgumentException;
+    use PDO;
+    use PDOException;
+
+    class BlacklistManager
+    {
+        /**
+         * Blacklists an entity with the specified operator and type.
+         *
+         * @param string $entity The UUID of the entity to blacklist.
+         * @param string $operator The UUID of the operator performing the blacklisting.
+         * @param BlacklistType $type The type of blacklist action.
+         * @param int|null $expires Optional expiration time in Unix timestamp, null for permanent blacklisting.
+         * @throws InvalidArgumentException If the entity or operator is empty, or if expires is in the past.
+         * @throws DatabaseOperationException If there is an error preparing or executing the SQL statement.
+         */
+        public static function blacklistEntity(string $entity, string $operator, BlacklistType $type, ?int $expires = null): void
+        {
+            if(empty($entity) || empty($operator))
+            {
+                throw new InvalidArgumentException("Entity and operator cannot be empty.");
+            }
+
+            if(!is_null($expires) && $expires < time())
+            {
+                throw new InvalidArgumentException("Expiration time must be in the future or null for permanent blacklisting.");
+            }
+
+            try
+            {
+                $stmt = DatabaseConnection::getConnection()->prepare("INSERT INTO blacklist (entity, operator, type, expires) VALUES (:entity, :operator, :type, :expires)");
+                $type = $type->value;
+                $stmt->bindParam(':entity', $entity);
+                $stmt->bindParam(':operator', $operator);
+                $stmt->bindParam(':type', $type);
+
+                // Convert expires to datetime
+                if(is_null($expires))
+                {
+                    $stmt->bindValue(':expires', null, PDO::PARAM_NULL);
+                }
+                else
+                {
+                    $stmt->bindValue(':expires', date('Y-m-d H:i:s', $expires));
+                }
+            }
+            catch (PDOException $e)
+            {
+                throw new DatabaseOperationException("Failed to prepare SQL statement for blacklisting entity: " . $e->getMessage(), 0, $e);
+            }
+        }
+
+        /**
+         * Checks if an entity is currently blacklisted.
+         *
+         * @param string $entity The UUID of the entity to check.
+         * @return bool True if the entity is blacklisted, false otherwise.
+         * @throws InvalidArgumentException If the entity is empty.
+         * @throws DatabaseOperationException If there is an error preparing or executing the SQL statement.
+         */
+        public static function isBlacklisted(string $entity): bool
+        {
+            if(empty($entity))
+            {
+                throw new InvalidArgumentException("Entity cannot be empty.");
+            }
+
+            try
+            {
+                $stmt = DatabaseConnection::getConnection()->prepare("SELECT COUNT(*) FROM blacklist WHERE entity = :entity AND (expires IS NULL OR expires > NOW())");
+                $stmt->bindParam(':entity', $entity);
+                $stmt->execute();
+                return $stmt->fetchColumn() > 0;
+            }
+            catch (PDOException $e)
+            {
+                throw new DatabaseOperationException("Failed to check if entity is blacklisted: " . $e->getMessage(), 0, $e);
+            }
+        }
+
+        /**
+         * Retrieves a blacklist entry by its UUID.
+         *
+         * @param string $uuid The UUID of the blacklist entry.
+         * @return BlacklistRecord|null The BlacklistRecord object if found, null otherwise.
+         * @throws InvalidArgumentException If the UUID is empty.
+         * @throws DatabaseOperationException If there is an error preparing or executing the SQL statement.
+         */
+        public static function getBlacklistEntry(string $uuid): ?BlacklistRecord
+        {
+            if(empty($uuid))
+            {
+                throw new InvalidArgumentException("UUID cannot be empty.");
+            }
+
+            try
+            {
+                $stmt = DatabaseConnection::getConnection()->prepare("SELECT * FROM blacklist WHERE uuid = :uuid");
+                $stmt->bindParam(':uuid', $uuid);
+                $stmt->execute();
+                $data = $stmt->fetch(PDO::FETCH_ASSOC);
+
+                if($data)
+                {
+                    return new BlacklistRecord($data);
+                }
+                return null;
+            }
+            catch (PDOException $e)
+            {
+                throw new DatabaseOperationException("Failed to retrieve blacklist entry: " . $e->getMessage(), 0, $e);
+            }
+        }
+
+        /**
+         * Deletes a blacklist entry for a specific entity.
+         *
+         * @param string $entity The UUID of the entity to remove from the blacklist.
+         * @throws InvalidArgumentException If the entity is empty.
+         * @throws DatabaseOperationException If there is an error preparing or executing the SQL statement.
+         */
+        public static function deleteBlacklistEntry(string $entity): void
+        {
+            if(empty($entity))
+            {
+                throw new InvalidArgumentException("Entity cannot be empty.");
+            }
+
+            try
+            {
+                $stmt = DatabaseConnection::getConnection()->prepare("DELETE FROM blacklist WHERE entity = :entity");
+                $stmt->bindParam(':entity', $entity);
+                $stmt->execute();
+            }
+            catch (PDOException $e)
+            {
+                throw new DatabaseOperationException("Failed to delete blacklist entry: " . $e->getMessage(), 0, $e);
+            }
+        }
+
+        /**
+         * Retrieves all blacklist entries for a specific entity.
+         *
+         * @param string $operator The UUID of the operator to filter by.
+         * @param int $limit The maximum number of entries to retrieve.
+         * @param int $page The page number for pagination.
+         * @return BlacklistRecord[] An array of BlacklistRecord objects.
+         * @throws DatabaseOperationException If there is an error preparing or executing the SQL statement.
+         */
+        public static function getEntriesByOperator(string $operator, int $limit = 100, int $page = 1): array
+        {
+            if(empty($operator))
+            {
+                throw new InvalidArgumentException("Operator cannot be empty.");
+            }
+
+            if($limit <= 0 || $page <= 0)
+            {
+                throw new InvalidArgumentException("Limit and page must be greater than zero.");
+            }
+
+            $offset = ($page - 1) * $limit;
+
+            try
+            {
+                $stmt = DatabaseConnection::getConnection()->prepare("SELECT * FROM blacklist WHERE operator = :operator ORDER BY created DESC LIMIT :limit OFFSET :offset");
+                $stmt->bindParam(':operator', $operator);
+                $stmt->bindParam(':limit', $limit, PDO::PARAM_INT);
+                $stmt->bindParam(':offset', $offset, PDO::PARAM_INT);
+                $stmt->execute();
+
+                $results = $stmt->fetchAll(PDO::FETCH_ASSOC);
+                return array_map(fn($data) => new BlacklistRecord($data), $results);
+            }
+            catch (PDOException $e)
+            {
+                throw new DatabaseOperationException("Failed to retrieve blacklist entries by operator: " . $e->getMessage(), 0, $e);
+            }
+        }
+
+        /**
+         * Retrieves all blacklist entries associated with a specific entity.
+         *
+         * @param string $entity The UUID of the entity.
+         * @param int $limit The maximum number of entries to retrieve.
+         * @param int $page The page number for pagination.
+         * @return BlacklistRecord[] An array of BlacklistRecord objects.
+         * @throws InvalidArgumentException If the entity is empty or limit/page are invalid.
+         * @throws DatabaseOperationException If there is an error preparing or executing the SQL statement.
+         */
+        public static function getEntriesByEntity(string $entity, int $limit = 100, int $page = 1): array
+        {
+            if(empty($entity))
+            {
+                throw new InvalidArgumentException("Entity cannot be empty.");
+            }
+
+            if($limit <= 0 || $page <= 0)
+            {
+                throw new InvalidArgumentException("Limit and page must be greater than zero.");
+            }
+
+            $offset = ($page - 1) * $limit;
+
+            try
+            {
+                $stmt = DatabaseConnection::getConnection()->prepare("SELECT * FROM blacklist WHERE entity = :entity ORDER BY created DESC LIMIT :limit OFFSET :offset");
+                $stmt->bindParam(':entity', $entity);
+                $stmt->bindParam(':limit', $limit, PDO::PARAM_INT);
+                $stmt->bindParam(':offset', $offset, PDO::PARAM_INT);
+                $stmt->execute();
+
+                $results = $stmt->fetchAll(PDO::FETCH_ASSOC);
+                return array_map(fn($data) => new BlacklistRecord($data), $results);
+            }
+            catch (PDOException $e)
+            {
+                throw new DatabaseOperationException("Failed to retrieve blacklist entries by entity: " . $e->getMessage(), 0, $e);
+            }
+        }
+    }
\ No newline at end of file